Former O.C. actress Rachel Bilson posed for the cameras as she walked the red carpet for the Ultimate Bachelorette Party that she hosted at The Bank nightclub in the Bellagio Resort Hotel and Casinoin Las Vegas on Friday night (September 5).

27-year-old Bilson will soon be serving as maid of honor at Josh Schwartz‘ (creator of the O.C. and Gossip Girl) wedding to his fiancée Jill.