Rachel Bilson on Mother's Day: I Don't Know!

Rachel Bilson picks up a small present in a shiny pink gift bag and hops into her Toyota Prius in Los Angeles on Saturday (May 8).

What will the 28-year-old actress get for her mom, sex therapist Janice, for Mother’s Day on Sunday?

“I don’t know,” she told OK!. “Something really great. My mom is the best. She’s an amazing person.”

10+ pictures inside of Rachel Bilson picking up a present…