“Right now she won’t leave the house without her straw fedora hat. It’s her favorite,” Bilson, 34, told PEOPLE Thursday at the launch of Target’s new children’s clothing line, Cat & Jack.
But when it comes to raiding her mom’s expansive wardrobe, Briar Rose is only obsessed with one thing.
“Her favorite thing to wear is my underwear on her head,” Bilson jokes. “She thinks it’s the best thing!”