Jon Gosselin’s new Buss It Baby is a lady lover.

Kate will not be pleased…

RadarOnline drudged up 22-year-old Joy Lawlor, who claims she bumped pelvics with Hailey Glassman for three years while the two were students at Indiana University.

During her turbulent romance with the future Mrs. Gosselin, Joy claims Hailey cheated on her, regularly lied to her, and introduced her to a cocaine addiction that would later land her behind bars.

With that in mind, Joy has a word of advice for the TLC reality star who is admittedly smitten with her former flame: Run.

“You are wasting your time with Hailey. She’ll destroy you.”

“For a girl so young she was very wild, both for drugs and for sex….I am speaking out because Jon Gosselin needs to know what he is getting himself involved in. Hailey comes across as a smart, likable girl. But she is manipulative and destructive.”