Crystal Harris Gets Wet 'N Wild With Heidi Montag In Vegas When She Should've Been At Her Wedding! (PHOTOS)

She was supposed to be walking down the aisle at the Playboy Mansion yesterday, June 18, but Crystal Harris displayed not even the slightest hint of regret at dumping Hugh Hefner as she partied poolside in the Las Vegas sunshine earlier.

Actually, the laughing 25-year-old chose to openly mock Hefner, 85, by posing up with her feet dangling in the pool to pore over the latest edition of Playboy Magazine with reality star, Heidi Montag, who was hosting the Wet Republic event at the Hard Rock Hotel.

Wearing a sexy black bikini and sheer leopard-print tunic rather than her wedding gown, the blonde - who had promised today would be 'the most romantic wedding ever,' seemed to revel in flaunting the magazine - which is yet another source of embarrassment for Hefner, as she is the cover girl.

Check out the photos!