(Cover) - EN Showbiz - Hugh Hefner has confirmed that his marriage to Crystal Harris will not go ahead.

Playboy magazine founder Hugh, 85, was expected to marry the 25-year-old Playmate model this Saturday. However, it has been alleged that the pair argued last weekend and Crystal has since moved out.

Hugh revealed that the ceremony had been cancelled via his Twitter account. "The wedding is off. Crystal has had a change of heart," he wrote earlier today.

Crystal's manager Michael Blakey has also spoken out about the star's last-minute decision, and has insisted the pair are still on good terms.

"I heard the sad news today this morning," Michael told People. "The split was a mutual decision and the two remain good friends."

Rumours have now surfaced that the blonde beauty is romancing Jordan McGraw, the son of television psychologist Dr. Phil.

"She has a boyfriend," a source told RadarOnline. "She is seeing Dr. Phil's son, Jordan. She thinks she is going to be living with all of Dr. Phil's millions."

Sources at the Playboy mansion have claimed that Crystal and Hugh had an argument over the phone which resulted in Crystal halting the scheduled nuptials.

"The wedding is off and everything has been cancelled," the source added to RadarOnline. "Hef is in shock. Crystal bailed and left the mansion at 11pm Sunday night."

The Playmate has also taken to her Twitter account and left a seemingly cryptic message.

"There are two mistakes one can make along the road to truth...not going all the way, and not starting," she wrote.

Hugh and Crystal had been dating for two years when he proposed to her in December last year. She would have been his third wife. (C) Cover Media