Jennifer Garner and husband Ben Affleck are expecting another baby, Garner’s former Alias co-star Victor Garber confirms to Usmagazine.com

"Yes, she is," Garber, who currently stars on ABC's Eli Stone, told Us when asked if recent speculation was true that the couple is expecting.

(Garber officiated the couple's 2005 wedding.)

A source adds, "She is five months pregnant. They are very happy."

Garner, 36, and Affleck, 35, are parents to two-year-old daughter Violet - one of Us' Babies of the Year.

"Honestly, that child is so inquisitive and so full of life — it’s all Jennifer and Ben!" Garber gushed to Usmagazine.com in November 2007. "I have to say, he’s an amazing dad and together, she’s a very fortunate little girl to be in that family!"

Garner hinted in October that she wanted to have another child.

"We definitely wonder what it would be like to have another - hopefully, knock on wood, someday," Garner told Britain's Marie Claire. "My job is great to have as a mom. I get to take breaks and then work in a really concentrated way. During that concentrated time, it sucks, but whatever."

Photos of Garner in loose fitting tops have had Web sites speculating about a bun in the oven for weeks.

Reps only confirmed Garner's first pregnancy after she and Affleck tied the knot on the Turks and Caicos on June 29, 2005.

When it comes to Violet, Garner has revealed she's a total daddy's girl.

"You know how as a kid you picture yourself with a tall, handsome husband, and you imagine him cuddling your baby?" Ben is like that, like, on crack," she told the May 2007 issue of In Style. "Violet prefers him to anyone. He's a teddy bear of a guy. Nothing makes me happier than to see the two of them together and her little hands on his face. He has a prevailing calm. Of course, he has the benefit of sleep."

Affleck recently opened up to Access Hollywood's Billy Bush about his happy family life.

"Things couldn’t be better. We’re kind of taking it easy and just kind of enjoying a little downtime at home," Affleck said.