GOSSIP NEWS >> Bikini Babe Heidi Montag Parties with Crystal Harris

While she was supposed to be walking down the aisle, Crystal Harris opted to spend the weekend in Sin City after breaking off her engagement with Playboy founder Hugh Hefner.

The blonde beauty headed to Wet Republic Pool in Las Vegas on Saturday (June 18), meeting up with former "Hills" star Heidi Montag - who was hosting the locale's weekly poolside bash while joined by Spencer Pratt.

During the outing, Heidi and Crystal took turns on the arrivals carpet before heading to a VIP bungalow - with Miss Montag changing into a skimpy bikini as she joined revelers while tossing back a little champagne.

As previously reported by GossipCenter, Miss Harris called off her wedding to Hefner a few days back - as she told press, “It was mutual between Hef and I. There was no fight, we sat down and we talked about it.” She added, "For a while I’ve been having second thoughts about everything. I haven’t really been at peace with myself lately. I didn’t think it was really fair to him.”