"It's so crazy, we're pretty inseparable," 'The O.C.' alum tells PEOPLE of her and her daughter Rachel Bilson is all about spending time with her favorite girl — her daughter Briar Rose.

'The OC' alum is a mom to daughter Briar Rose, whom she shares with ex Hayden Christensen Rachel Bilson's little girl is celebrating double digits. On Tuesday, Oct. 29, The O.C. alum, 43, shared a ...

All About Rachel Bilson and Hayden Christensen's Daughter Briar Rose Rachel Bilson Shares Rare Photo of 'Beautiful' Daughter Briar as She Celebrates Her 10th Birthday: 'You're My Reason' Rachel ...

In the Instagram post on Thursday night, Bilson joked around with her old classmate, who is currently nominated for an Oscar Joelle Goldstein is a Senior News Editor on the TV team for PEOPLE Digital.