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Crystal Harris

Courtesy of Denice Truscello/WireImage.com

Is Crystal Harris grieving over her canceled wedding to Hugh Hefner?

Well, she is wearing a black bikini.

The newly single Playboy covergirl headed to Las Vegas to spend what would have been her big day, and we've got video to go with the pictures...

After hitting the carpet and posing for photos in her swimwear at Wet Republic's pool party Saturday, Harris lounged in a bungalow with the July issue of Playboy—you know, the one featuring her on the cover. And just for kicks, the DJ played her new debut single, "Club Queen," which just so happened to be released Tuesday, the day they called the whole thing off.

Needless to say, Harris is doing just fine post-split.

"I'm doing OK," Harris told E! News cameras at the event. "I just had to get away. Today is the day, and I just had to get away."

And as for why she called off the wedding in the first place, Harris said at the event, "I wanted to be true to myself and be true to what was best for everybody. It was a mutual decision between the both of us. I'm giving Hef back the ring…I just want to move forward."

So, what did Hef's ex and E's own Vegas queen, Holly Madison, think of Harris's pool party?

"That's disgusting and whoever booked her is tacky!" Holly tweeted Saturday about the shindig.