Jason Biggs, Jenny Mollen expecting baby boy

April 25 (UPI) -- Jason Biggs and Jenny Mollen are expecting another baby boy.

Mollen, a 37-year-old actress who has appeared on Angel and Girls, announced in an Instagram post Monday that she's pregnant with her second son.

"To quote Beyoncé, "I have two penises" (not twins. Just mine and the one inside me.) #Itsaboy," she captioned a photo of her baby bump.

Biggs and Mollen, who co-starred in the 2008 movie My Best Friend's Girl, already share 3-year-old son Sid. The couple announced this month that they're expecting again, and celebrated their ninth wedding anniversary Saturday.

"First year of marriage is paper, second year is cotton and ninth year is sex on an Audi. Happy Anniversary, baby!" the actress captioned a picture of herself and Biggs.

"According to @jennyandteets2 the 9th year wedding anniversary is sex on an Audi. I'm just going with it," the actor wrote in response.

Biggs, who is known for the American Pie movies and Orange is the New Black, told People in 2014 that parenthood has "completely changed" him and Mollen.

"She sees it in me, and I see it in her, and we're stronger now because of it," he said. "The change that happens is so tangible. It happens overnight, and it's the craziest thing."