We caught up with O.C. cutie Mischa Barton yesterday afternoon post-workout and asked her about those nasty comments ex Brandon Davis (allegedly) Tweeted:

"I don't know anything but I'm going to get my salad," she explained. Hmm, okay then!

Our photog complimented her before inquiring once more and Mischa again claimed to have "no idea" what Brandon Davis might've said. Mmkay, enjoy your salad!

Unfortch she did get a parking ticket on her way out. Gotta read those signs, girl.