EXCLUSIVE: Mischa Barton Tells OK!, "I'm Really Happy!"

Despite having been hospitalized following a mysterious breakdown only a few weeks ago, Mischa Barton insists to OK!, "I'm feeling great! I'm really happy."

Speaking exclusively to OK! on Sunday night at the Arizona Ice Tea-sponsored party for Music Unites, the controversial actress revealed that filming on her new movie The Beautiful Life is, "Going really well... I'm excited."

For most of the evening, Mischa sat snuggled up on a sofa at the Cooper Union Hotel, drinking water and talking to a male party-goer. Around 10:40pm, Mischa and a gal-pal exited the party to "go home to watch True Blood."

Said one fellow guest to OK! about Mischa's behavior, "She seemed to be in a good mood. She was smiling and appeared to be genuinely happy."

CHECK OUT THE GALLERY FOR ALL 11 PHOTOS OF MISCHA! %%{gallery}%%