"It's so crazy, we're pretty inseparable," 'The O.C.' alum tells PEOPLE of her and her daughter Rachel Bilson is all about ... whom she shares with ex-husband Hayden Christensen.

How quickly can you solve it? Play now! On an August episode of her podcast Broad Ideas with Rachel Bilson & Olivia Allen, shared that Briar is different from other children because she doesn't ...