Hugh Hefner and his Crystal Harris at the opening night gala of the 2011 TCM Classic Film Festival in Hollywood
Hugh Hefner and his fiancee, Playboy Playmate Crystal Harris, arrive at the opening night gala of the 2011 TCM Classic Film Festival featuring a screening of a restoration of 'An American In Paris' in Hollywood, California April 28, 2011. REUTERS

Hugh Hefner said ex-girlfriend Crystal Harris lied about their sex life when she said sex with him lasted "like two seconds."

On Tuesday, Harris, 24, went on Sirius XM Radio's Howard Stern Show and claimed that sex with the 85-year-old Playboy magazine founder and publisher only lasted "like two seconds."

Harris she and Hefner had sexual intercourse only once.

"Then I was over it," she told Stern. "I just like, walked away. I'm not turned on by Hef. Sorry."

But Hefner fired back via Twitter stating that, "Crystal lied about our relationship on Howard Stern but I don't know why. Maybe a new boyfriend?"

But Hefner believes that wasn't the only thing Harris lied about.

"Crystal convinced me that she adored me. That was the first lie," the Playboy mogul tweeted to one of his followers.

Harris ended her engagement to Hefner last month, just five days before their June 18 wedding.

Us Weekly reported that the 25-year-old was allowed to keep her $90,000, 3-carat diamond ring and her Bentley. Hefner took custody of his dog Charlie, who is now living at the Playboy Mansion.

Hefner also told a follower that after the whole ordeal he feels "sorry for Crystal" and that "she seems lost."

"I'm happy to be in a better place with new girlfriends Anna Sophia Berglund & Shera Bechard," Hefner tweeted on Tuesday.

Watch Crystal Harris talk about sex with Hugh Hefner below.