Hugh Hefner and Crystal Harris

Hugh Hefner must cope with remaining a single man.

"The wedding is off. Crystal has had a change of heart," Hefner tweeted on Tuesday.

According to People, as first reported by TMZ, the 25-year-old Crystal Harris called off the wedding earlier Tuesday. The pair was scheduled to walk down the aisle Saturday.

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

Hefner, the 85-year-old Playboy founder who's been married twice before, proposed to Harris on Christmas Eve. Their wedding was going to be televised on Lifetime.