Looking at a photo of Mollen during Biggs' appearance on her show "Chelsea Lately" Wednesday night, host Chelsea Handler observed Mollen's breasts looked bigger than she remembered them being.
"Her breasts are very big these days. Would you like to know why?" Biggs, 35, asked Handler. "Cause I put a baby in her belly!"
Mollen, 34, confirmed her pregnancy by posting a sonogram image on Instagram.
The couple married in April 2008 after they met on the set of "My Best Friend's Girl," People.com said.