Peter Gallagher Talks Watching Costar Mischa Barton Navigate Fame During 'The O.C.'

Peter Gallagher Recalled Working With Mischa Barton On "The O.C.," And How He's Grateful She's "Still Alive"

Peter Gallagher Is 'So Grateful' That Mischa Barton Is 'Still Alive'

Peter Gallagher is grateful Mischa Barton is 'still alive' after dealing with 'toxic' fame as a teen star