If you're glamming up to go to the Ballet Ball tomorrow night, you may just have a chance to rub shoulders with a certain O.C. soap star. It seems Mischa Barton accepted an invitation and will be coming to Hong Kong with her mum for the event. She arrived in town yesterday and leaves on Sunday. She'll be dropping by Dior to be fitted for a dress, but otherwise it seems she's planning to be a good girl, turning down offers of late night parties. Actually, Barton told local reps that this will be a nostalgic trip because years ago her mother and father worked in Hong Kong and lived in Happy Valley. Well, it may not be as nice as O.C., but it's still a good district.