Watch what you say about Usher's lady!

The formerly press-shy R&B star is so mad for his fiancée, Tameka Foster, that he has been calling radio hosts to blast them for making fun of her.

According to syndicated host Tom Joyner, the mild-mannered Grammy winner recently threatened to "whup my a-" after Joyner joked about rumored tension between Foster and Usher's mom, Jonetta Patton.

Joyner said Usher called him off-air to complain about claims that Foster urged him to "fire" Jonetta as his manager. (Word is Usher was particularly unamused when Daily News contributor Jawn Murray quipped to Joyner during the broadcast: "I wonder if he's going to put a pink slip in her Mother's Day card?")

Joyner and sidekick J. Anthony Brown made much of Usher's fury last week aboard the Fantastic Voyage Cruise, where LL Cool J, the O'Jays and others performed during a Caribbean benefit for historically black colleges.

"Who's afraid of Usher?" asked Joyner, prompting laughter from ship guests. Joyner and Brown even invited anyone in the audience who knew Usher "to tell him we're not afraid of him." Usher is also said to have called WBLS host WendyWilliams and Hot-97's Angie Martinez to "ask them to lay off Tameka," a source tells us.

The personal call to Williams comes as a surprise to those who remember Usher hurling curses over his shoulder as he dashed away from the deejay on the red carpet of the Soul Train Awards a few years ago. (This was after Williams had invited Foster onto her show - only to kick her out of the studio when Foster failed to deliver the expected dish on why she was fired as Usher's stylist.)

"It's so out of character for Usher to take such a handson approach to the media," said Murray. "He must really love this girl."

Usher rep Chris Chambers said, "I don't know of my client calling or threatening anyone. Radio personalities are going to talk about current news. We can't put a muzzle on anybody."

Usher may have good reason to be protective of his mate. The rumor's flying again that she's pregnant. Though his reps have denied that the couple is expecting, spies at the recent Bahamian opening of the Cove at Atlantis noticed that Foster seemed to cover her tummy every time a photographer loomed.

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It's the cultural partnership America has been waiting for.

Wilmer Valderrama could collaborate with Kevin Federline on his next album, according to a late-night party pact sealed in Las Vegas over the weekend.

The new BFFs "chilled out together and insisted on rapping along to every song played," laughs a witness. "K-Fed invited Wilmer to be involved with his next album."

Britney's baby-daddy even had a nifty new trick to foil the paparazzi at Heineken's Thirst Studio Global Sessions. "He had a little flashlight he would shine in cameras so they couldn't get any shots."

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Jordin Sparks says that she can’t take credit for her fabulous voice because it’s a gift from God. Apparently, the “American Idol” winner also had a little more earthly help: she reportedly had a vocal coach. That may come as a surprise to Sparks’ fans because on her official bio on the “Idol” Web site, when asked if she ever had formal training, Sparks answered, “No.”

“Jordin was just 14 years old when she studied with me in 2004,” vocal coach Melissa Black told Star magazine. “Her mom, Jodi Sparks, and her grandmother, Pam Wiedmann — who acts as her manager — found me on the Internet. We were together for nine months of intense vocal work, with Jordin taking one 30-minute class a week at $25 per class … I knew she wouldn’t take long to perfect her craft because she was so good.”

Black says they haven’t spoken since Sparks stopped taking the classes, and she said mostly good things about her alleged former student. Nevertheless, Black admits, she was “hurt for a week” when the “Idol” winner said that she hadn’t had any formal training. “Jordin didn’t have to mention my name, but at least acknowledge you had training,” she told the tab. “But I’ve moved on, and I hold my head up high.”

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Gwyneth Paltrow is renting her childhood home. The “Proof” star was beside herself when her mother, actress Blythe Danner, sold the four-bedroom Santa Monica house where Paltrow lived until she was 11 for more than $8.6 million, according to Us. “Gwyneth couldn’t talk about it. She was very upset,” and insider told the mag. So she rented it from the owner while she’s filming “Iron Man.” Says the source, “They just had (her daughter) Apple’s third birthday party there.”

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The feud between Lindsay Lohan and Hilary Duff is over.

Duff says she ended all the “weird weirdness” between them. “Lindsay and I were out at the same place, and we were like, ‘Let’s get this out of the way.’ And she was really nice, and I was really nice,” the “Lizzie McGuire” star told Canada’s Globe and Mail. The singer/actress says the whole thing reminds her of her high school years when she was shooting the television series and friends would share their “intense” dramas. “They’d say, ‘Oh my god, you’ll never believe what this guy did,’ and I’d be like, ‘Hmm, we just shot an episode about that last week.’ But it’s nice to be able to see Lindsay out and say hi, and not have this weird weirdness.”

But Duff seems to be inviting more weird weirdness with not only Lohan, but with Britney Spears and Paris Hilton as well. A song on her new album, reports the paper, “scorns” her three rivals. In it, she sings: “It’s all about you, we got it, we got it. It’s not news when you got a new bag.”

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Pam Anderson says she let her kids watch “Borat” — but beforehand had to explain about the infamous sex tape she’d made with their father.

“They really wanted to see ‘Borat’ and I finally had a breakdown and let them because all their friends had,” the former “Baywatch” babe told the London Sun. “I said, ‘There are a few things we have to talk about before you see ‘Borat.’’ And they go: ‘We know about the magazines.’ So that was one gone!”

Still, she said, she verbally bleeped out the parts of the flick that mention the sex tape Anderson made with their father Tommy Lee, which is mentioned in the movie. “I kind of went ‘la la la la la la la’ over the parts I didn’t want them to hear,” she said. “Actually, I did tell them, I said: ‘You know, when your dad and I were first together we used to video tape everything. Everybody’s naked, hugging, kissing, all that good stuff and someone stole the tape. And I remember when we were watching the film and (her son) Dylan goes: ‘You mean everybody has seen this?’ And I said, ‘Yes.’”

Asked what her sons think of her being a sex symbol, she told the paper: “They don’t think of me like that. They know I’m at school with the neon vest parking cars and doing safety patrol.”

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OK! Magazine reports that when they asked Enrique Iglesias what body part he most wants to change, the crooner replied “My (private part). It’s way, way, way too small.” Did he really say that? “His publicist must have been distracted,” an insider says. ... Heidi Klum says she has names for her boobs. She calls one Hans and the other Franz. “They’re German,” she explained.

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Lindsay Lohan's dad has teamed up with a firebrand preacher to establish a $15 million treatment center in Southampton - for people like his drink- and drug-addled daughter.

Michael Lohan, who reacted in horror to Lindsay's lifeless image on The Post's front page yesterday, has joined fellow carouser-turned-Christian Stephen Baldwin and other wealthy backers in funding the project. The facility would rise on a lush 10-acre tract owned by Donald Havrilla, the controversial pastor of the Southampton Full Gospel Church.

Havrilla, who holds staunch anti-abortion and anti-gay views, said he was approached by Michael Lohan and Baldwin about the plan through an intermediary. "I'm not part of the Hollywood crowd," Havrilla said. "But I talked with these guys and was pleasantly surprised."

Havrilla said that the center will offer high-end accommodations for the area's affluent addicts but wouldn't coddle them.

"The pillows might be softer, but that's about it," he said.

"They must accept Jesus Christ as their lord and savior if they are going to be here."

The former steel mill worker said he has never even heard of Lindsay Lohan until meeting with her father two weeks ago.

"From what I can tell, she needs help," he said. "I'm praying for her."

Michael Lohan, who is undergoing drug treatment in a West Babylon facility, said: "We want to turn people's lives around. Rich, poor, it doesn't matter."

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NOTE to music industry legend Clive Davis: Stop trashing Kelly Clarkson - you are making yourself look bad.

"Clive is furious because Kelly has assumed total artistic control over her new album and refuses his suggestions," according to an insider at Sony BMG, the parent of Clarkson's label, RCA.

Davis, who runs Sony BMG, slammed Clarkson at a company retreat in April, saying she can't produce hits.

And music industry insiders were dumbfounded when Davis took the stage during the "American Idol" finale to plug Taylor Hicks and Katharine McPhee's new singles, but failed to mention Clarkson's third album, "My December," which debuts in June. Instead, Davis promoted the songwriters for one of Clarkson's hits, "Since U Been Gone."

Our insider said, "She wrote all of the second album herself - including the hits 'Because of You,' 'Behind These Hazel Eyes' and 'Walk Away.' Clive hated 'Because of You' so much, he would routinely mock it in meetings. It was one of her most successful singles."

Clarkson is not only one of Sony BMG's most profitable artists, having sold close to 15 million albums - she is also not a diva.

She hasn't demanded to renegotiate her deal with the label, our source said, even though "she only gets like $250,000 an album when she could get millions. She refuses to take more money because she wants artistic control. And she has always turned out to be right. If Clive had had his way, she wouldn't have sold nearly as many albums as she did.

"We are appalled he is picking apart one of our own acts - and one that we all love."

The source added, "Kelly wanted to make a deeply personal record. Here's an artist who didn't demand more money, who handed in her record on time in January, after making him millions, and now he rips her? The music business is collapsing, and this is why. They won't let people put out their real music. This is about his huge ego."

But a Davis pal said, "Clive gave her 'Hazel Eyes' and 'Walk Away' and he gave her the production company to help make 'Because of You' a hit. We pay millions for the albums. This is incorrect."

Clarkson's rep didn't return calls, and Davis' rep declined comment.

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PARIS Hilton was axed from an upcoming photo book of the world’s most stunning heiresses - even before The Post reported that her half-aunt, Elizabeth Avanzino, is a junkie jailbird. Celebrity lensman Roger Moenks planned to include the heir-head in “Inheriting Beauty,” along with Roberta Armani, Dylan Lauren, Allegra Hicks, Nadja Swarovski, Casey Johnson and other wealthy young women. But Moenks and his editors “bounced Paris by unanimous vote,” said his agent, Marianne Strong. “She’s tried to play society like a game of Three-card Monte. Let’s hear it for high standards.” Hilton’s rep had no comment.

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LEAVE it to Ozzy Osbourne to label a ridiculous pop sensation like Sanjaya Malakar "a hairstyle-challenged idiot." An insider told Page Six Osbourne was confirmed to perform on last week's finale of "American Idol," but canceled at the last minute "when he learned he would have to do a duet with Sanjaya. Ozzie said he didn't want to be onstage with that idiot." Fox ended up pulling Steve Perry from Aerosmith to do the somewhat embarrassing duet with the artist with the gimmicky hair. Osbourne also laid a few personal insights on the June issue of Details: "For a long time I was a real [bleep]ing addict and alcoholic. But I very rarely went onstage loaded. At the end of the show - that's when I'd get Vicodin'd." Not that his wild days are entirely behind him, though. Osbourne told Details he went to the White House Correspondents' Dinner in 2002, "absolutely [bleep]ing loaded . . . Yeah, um, I was [bleep]ing out of my tree. I was absolutely [bleep]ing loaded."

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ONE of Mark Wahlberg's former bodyguards is annoyed at HBO's "Entourage," which is produced by Wahlberg and based on his life. Leonard Taylor, who worked for Wahlberg for a long time "back in the day" and is African-American, told us, "There are no black people on the show. There are no black or Latino bodyguards, like Mark used to have - it's a slap in the face. People always ask me, 'Why is there no character based on you in "Entourage"?' " A rep for the series said, "The show is only loosely based on Mark Wahlberg's experience. There aren't really any bodyguards, and as for being multicultural, Turtle [one of the main characters] is dating an African-American."