Crystal Harris explains why she called off her wedding to Hugh Hefner

STANSTED, ENGLAND - JUNE 02: Playboy founder Hugh Hefner and his wife Crystal Harris arrives at Stansted Airport on June 2, 2011 in Stansted, England. Mr Hefner is back in the UK to mark the launch of the new Playboy Club in Mayfair, which opens on June 4. The club's opening will welcome back the iconic Playboy Bunny to London after a 30 year absence. Famous Bunnies have included Debbie Harry and Lauren Hutton. (Photo by Dan Kitwood/Getty Images)
Dan Kitwood
Playboy founder Hugh Hefner and his fiancee, Crystal Harris, arrive at Stansted Airport on June 2, 2011, in Stansted, England.
Dan Kitwood/Getty Images

(CBS) Crystal Harris says she called off her wedding to Hugh Hefner, which was to take place on Saturday, because the Playboy founder's lifestyle wasn't for her.

"Hef's lifestyle isn't the most normal lifestyle," Harris, 25, told Ryan Seacrest on his radio show Wednesday. "This isn't the lifestyle for me, multiple girls around all the time, the Playboy lifestyle. I don't know. I just wanted to be true to myself."

Pictures: Celebrity splits
Hugh Hefner and Crystal Harris' wedding called off

"For a while, I've been having second thoughts about everything," she said. "It all happened so fast, and they were going to air a show on it. It was all happening too fast for me."

It was initially reported that Harris, a Playboy Playmate who appeared with Hefner on E!'s "The Girls Next Door," called off the wedding after the couple had a "nasty argument" on the phone, but she told Seacrest that was untrue.

"It was mutual between Hef and I," Harris explained. "There was no fight, we sat down and we talked about it."

"We both agreed that it wasn't the best idea to get married. He kind of told me that he was doing this wedding for me because he thought that's what I wanted," she said, later adding. "We were both kind of relieved."

She also denied that she's dating anyone else, despite rumors that's she's romantically involved with Dr. Phil McGraw's songwriter son Jordan McGraw.

"No, not seeing someone else," she told Seacrest. "Of course I have friends, plenty of friends in the music business. That's normal."

Her manager Michael Blakey told People magazine that Harris and McGraw "wrote a song together and that was the extent of their relationship."

Harris' single, "Club Queen," was released on Tuesday.

Meanwhile, Hefner has already made plans for what would have been his wedding night.

"Since we're not getting married on Saturday, I've scheduled a movie: 'Runaway Bride.' Seems appropriate," he tweeted.

"The breakup is a heart breaker," Hefner added, "but better now than after the marriage."