Michelle Monaghan is pregnant with her second child, Us Weekly can confirm. Credit: Mark Davis/Getty

Baby on board! Source Code actress Michelle Monaghan is pregnant with her second child, a source confirms exclusively to Us Weekly.

The 37-year-old is expecting a baby with her graphic artist husband, Peter White. The couple, who married in 2005, are already parents to 4-year-old daughter, Willow Katherine. Monaghan will give birth this fall, according to the source.

The Iowa native is already a pro at parenting. "On my kitchen counter sits a KitchenAid mixer, a potty seat, and a small pile of scripts," she told Women's Health magazine of motherhood in 2010. "That pretty much sums it up. I'm a homemaker, a potty trainer, and a part-time pretender."

The former model told the magazine that a previous skin cancer scare -- and motherhood in general -- taught her the need to get healthy and eat better. 

"For the first time, I thought about my well-being," she said, noting that hiking is her favorite form of exercise. "Now I'm trying to instill healthy eating habits in my daughter, so by default my husband and I are eating healthier."