TMZ caught the county-hopping party mom bopping away at a fashion show inside O.C.'s Sutra Lounge, smiling and laughing as she watched a group of mega-hot, stacked models walk the runway.
Brit looked surprised when her new song "Gimme More" started playing during the show and quickly disappeared into the crowd, finding a more secluded position for the rest of the night. Spears didn't stick around to party once the show was over. It's a long drive back, y'all!