We are seriously upset with Lauren Conrad today. After leaving an L.A. nightclub on Sunday night, she piled into a friend's Rolls Royce Phantom with Heidi Montag, Brody Jenner, and a few too many pals, a video on TMZ shows. To accommodate for the extra riders, Brody sat in the front passenger seat of the car -- and L.C. sat on his lap! (So dangerous.) Needless to say, they weren't wearing a seatbelt.

Perhaps thoughts of their rekindled romance made them forget how stupid their on-road behavior was?