09/07/2011 AT 10:00 AM EDT
hung out with bestie Lauren "Lo" Bosworth
in L.A., arriving just before midnight. Conrad played bartender, serving up Grey Goose cocktails at their table, and also got up to casually flirt with a few male clubgoers. Says an onlooker: "She was looking to have fun," and Conrad and Bosworth spend much of the night laughing together.