red boots Rachel Bilson refused to comment on her former co-star's recent hospitalization when we caught the O.C. cutie out in LA.

Now, although Summer and Marissa may have been the best of friends in the O.C., Rachel and Mischa's lives in LA have taken dramatically different paths, so it's possible she's no longer in touch with the troubled actress. But wouldn't an O.C. reunion be great for us...and maybe even good for Mischa?