With Hugh Hefner and Crystal Harris’ Lifetime special Hef’s Runaway Bride only a week away, it seems like both halves of the one-time couple are moving on just fine from their surprising breakup.

Hef’s got his new No. 1 lady, Playboy’s Miss January 2011 Anna Sophia Berglund.

And now, Harris may be rebounding with a romance of her own…

Over the weekend, Hef’s former fiancée hit Pure nightclub in Las Vegas, where she was caught flirting with one of her party pals.

Upon arrival, Harris and her entourage of 10 were escorted to a VIP table, where the aspiring singer drank champagne, took photos with fans and danced on seating booths with friends. According to a source, Harris and her mystery man were “trying hard not to show their feelings for one another during the party, [but] it was obvious to those around that Harris only had eyes for him.”

Throughout the night, Harris, in a short black sequined dress, was spotted getting close and talking intimately with her guy. While we don’t know his exact age, we can say he’s a lot younger than Hef.

In a photo of Harris, the dark-haired dude can be seen standing behind the blond beauty wearing dark pants and a dark gray sweater over a white collared shirt. The two avoided getting photographed together by separating whenever camera guys got close.

There was no visible PDA, but they did “sneak away at the end of the night, as they were seen leaving together while the rest of Harris’ friends stayed behind,” our source said.

Harris wasn’t the only former Hefner girlfriend partying it up with a hot hunk over the weekend…

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