Britney Spears "Talked About Clothes and Dogs" on Set

So what was Britney Spears like on the How I Met Your Mother set?

"She was lovely," Allyson Hannigan told Usmagazine.com at the sitcom's re-launch party in West Hollywood Thursday.

"She’s just a person — so sweet and funny," Hannigan added. "We just talked about our clothes and dogs, and it was surprisingly just normal."

The rest of the cast couldn't stop raving about the actress — who shot scenes Wednesday and Thursday in L.A. — either.

"She’s beautiful," actor Jason Segel told Us. "You know, I was so focused on her hair that I’m overwhelmed with adjectives! She was great and lovely."

He said he wasn't surprised that Spears nailed her role as a dorky receptionist who falls for Ted (Josh Radnor).

"She was great," Segel added. "She was better than all five of us, so I guess that says a lot."

Added Cobie Smulders, "She was very professional and her comedic timing was great!"

The cast shrugged off rumors that Alicia Silverstone turned down a role on the show after learning that Spears was on board.

"I think there was some scheduling problems or something," Smulders said, adding that Scrubs star Sarah Chalke "came in at the last second."

Neil Patrick Harris said "there’s hope" Silverstone may still appear on the show at some point.

"She’s seemed to avoid that weird actress trap of only being able to do a very limited amount of things," he told Us. "She’s gone on to do interesting theater, so you’ve got to respect her chops now.

"She’s making smart choices so if she wants to come play with us, we’d be glad to have her!"

Spears' How I Met Your Mother episode airs March 24.

Re: Britney Spears "Talked About Clothes and Dogs" on Set

WOW, maybe she'll win an Emmy for her performance