BSPEARS4AM1202_001.jpgBSPEARS4AM1202_003.jpgBritney Spears BSPEARS4AM1202_035.jpgAfter a night of partying with pals Paris, Sam, Alli (not to mention E! News Correspondent Jason Kennedy, who partied with Britney on Halloween), Britney ended her birthday bash back at the Four Seasons. The group partied on the balcony until 4 am, when Britney headed back home.