Peet welcomed daughter Frances "Frankie" Pen (named after her mother, Penny) in 2007.
She has said that motherhood changed her.
"One surprise of motherhood for me was how little control I have," she told Cookie magazine this past summer. "I thought it would be an extended, blissful romance with me at the helm, cuddling this little creature to life. It's been bittersweet and humbling to let her lead, and to try not to be perfect myself."