Well, so much for that: Hugh Hefner confirmed Tuesday that his wedding to 25-year-old model Crystal Harris has been called off. (Big shocker!)

"Crystal has had a change of heart," he said via Twitter.

Harris also responded to reports on her personal website, saying, "After much deep reflection and thought I have decided to end my engagement with Hef. I have the utmost respect for Hef and wish him the best going forward. I hope the media will give each of us the privacy we deserve during this time."

So what exactly caused the last-minute cancellation? Though unconfirmed, sources for TMZ claim Hefner, 85, and Harris had a "nasty argument" last weekend over the phone, prompting Harris to pack her bags and leave the Playboy mansion.

It is also rumored that Hefner only gave her a couple of hundred dollars a week and she wanted to go out and make her own money as a singer. Well I guess now she can!

The couple was set to marry this Saturday, June 18.

[TMZ]