"It's so crazy, we're pretty inseparable," 'The O.C.' alum tells PEOPLE of her and her daughter Rachel Bilson/Instagram; Michael Kovac/Getty Rachel Bilson is all about spending time with her ...

Rachel Bilson and Hayden Christensen welcomed their ... "I think she knows that her mom — and her dad's an actor too — so she kind of knows that we are in that world," she explained.

The OC' alum is a mom to daughter Briar Rose, whom she shares with ex Hayden Christensen Jason Kempin/Getty; Rachel Bilson/Instagram Rachel Bilson's little girl is celebrating double digits.

Rachel Bilson and daughter; Rachel Bilson attends the celebration for the 21st Birthday and Launch of The O.C. x 21Seeds Campaign on July 31, 2024 in Los Angeles, California. Rachel Bilson is all ...

"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.