One played an Orange County rich kid on TV. The other is an Orange County rich kid who may be even more famous playing herself on TV.
But who wins a style showdown between Mischa Barton and Lauren Conrad?
The former star of The OC wore a floral Roberto Cavalli gown to a party in Cannes, France, while the star of The Hills chose a simpler version of the dress to celebrate her hit reality show's fourth season premiere.
Who looked best? Vote in the poll below!