Hugh Hefner and Crystal Harris' wedding called off

(CBS) Hugh Hefner and Crystal Harris were supposed to tie the knot on Saturday, but now the Playboy founder says the wedding won't happen.

Hefner confirmed the news on his Twitter account on Tuesday, saying it was Harris who called off the nuptials.

Pictures: Celebrity splits
Pictures: Crystal Harris

"The wedding is off," he wrote. "Crystal had a change of heart."

TMZ, citing sources in the Playboy mansion, reports that the couple had a "nasty argument" over the phone last weekend. After the fight, Harris called off the wedding and moved out of the mansion.

Hefner, 85, and Harris, 25, got engaged in December, when he presented her with a ring as a Christmas gift. Last month, hetweeted a photo of their wedding invitation.

This would have been Hefner's third marriage.