STORY HIGHLIGHTS
* Harris, 24, said that sex with the 85-year-old lasted "like two seconds"
* "I'm not turned on by Hef, sorry," she said
* Harris is spending a great deal of time with Dr. Phil's son Jordan McGraw
Crystal Harris is moving on from Hugh Hefner, but not without taking a few parting shots at her former fiancé.
Harris, 24, said Tuesday on Sirius XM Radio's Howard Stern Show that sex with the 85-year-old Playboy founder lasted "like two seconds."
"Then I was just over it," she says. "I was like, 'Ahhh.' I was over it. I just like, walked away. I'm not turned on by Hef, sorry."
She adds that they had sex just once.
"He doesn't really take off his clothes," Harris says. "I've never seen Hef naked."
Now that Harris has parted ways from Hefner, she is spending a great deal of time with Dr. Phil's son Jordan McGraw.
Although denying a reported romance with the songwriter in June, Harris was spotted out with him recently at Knave, the upscale and dimly lit bar at Le Parker Meridien in NYC.
"They were joined by two women who stayed for about an hour," an onlooker tells PEOPLE. "Crystal was drinking mojitos and laughing, and Jordan was sipping a drink on the rocks. But once their friends left, they really settled in and seemed more and more comfortable."
Hugh Hefner: Crystal Harris lied about our sex life
STORY HIGHLIGHTS
* Hefner tweeted that Harris lied while on Howard Stern's show
* Hefner continued to call out Harris, 25, for what he pegged as dishonesty
* He publicly moved on from Harris days after their wedding was called off in June
His runaway bride dissed his bedroom abilities -- but Hugh Hefner isn't taking the insults lying down.
After ex-fiancée Crystal Harris told Howard Stern that sex with the 85-year-old Playboy founder lasted "like two seconds" on Tuesday's show, Hefner retaliated: That's not the case, he says.
"Crystal lied about our relationship on Howard Stern but I don't know why," Hef tweeted Tuesday night, although he has since removed the message from his account. "Maybe a new boyfriend?"
Hefner continued to call out Harris, 25, for what he pegged as dishonesty. "Crystal convinced me that she adored me," he replied to another follower. "That was the first lie."
The only sympathy he had for Harris, who has been spotted keeping close company with Dr. Phil's son Jordan McGraw, came in the form of another seeming dig. "I feel sorry for Crystal," he continued. "She seems lost."
Although insisting that he is "pro-Crystal," Hefner said he's "happy to be in a better place with new girlfriends Anna Sophia Berglund & Shera Bechard."
But there's one thing the iconic ladies' man, who publicly moved on from Harris days after their wedding was called off in June, said is indeed true: his feelings for the Playmate when they were in a relationship.
"When I said, 'I missed a bullet' when Crystal left, I didn't mean I didn't love her," Hef explained. "I meant that I realized she didn't love me."