Laguna Beach stars Lauren "L.C." Conrad and Jason Wahler have split up, PEOPLE has confirmed.
"Its true. Lauren broke up with him last week," Conrad's rep, Nicole Perez, tells PEOPLE.
Being single isn't slowing Conrad down a bit: The 20-year-old, who now appears on The Hills, took a trip to Las Vegas last weekend with her girlfriends, including Hills pal Heidi Montag.
Meanwhile, Wahler, 19, partied in Los Angeles over the weekend at Les Deux with Laguna pal Stephen Colletti. Wahler, wearing Adidas track pants and a t-shirt, got wild on the dance floor, according to a source.
"He was all over the place," says the onlooker. "Every time I saw him, he was talking to a different girl."
Wahler's partying ways contributed to the couple's breakup, a source tells PEOPLE.
This is not the first time Wahler and Conrad have split. The pair broke up last August, then reunited. "We're pretty serious now," Conrad told PEOPLE in May.
As for the future, Conrad plans to return to L.A.'s Fashion Institute of Design & Merchandising in the fall, and will film a second season of The Hills.