Hugh Hefner died at

Playboy founder Hugh Hefner said Tuesday his wedding this weekend has been canceled because his girlfriend, a Playmate from his magazine, changed her mind.

Hefner, 85, and Crystal Harris, 25, were due to tie the knot in front of more than 300 guests at the Playboy Mansion in Los Angeles Saturday. It would have been Hefner's third marriage.

News of the split was first reported by TMZ, which said the couple had "a nasty argument'' on the phone over the weekend and Harris moved out of the mansion. Hefner's publicist was not immediately available for comment.