To put it mildly, Hailey Glassman isn't afraid to kiss and tell — and destroy! — when it comes to her famous ex-boyfriend Jon Gosselin.

In a shocking new interview with Steppin Out magazine, Glassman, 23, goes into graphic, alleged detail about having sex with the 32 year-old father of eight. "He was so small I didn't think he would cheat on me," Glassman claims.

"He's hung like a nine-year-old boy," she snipes. "I'm serious. This is true," she adds, even claiming he measures up to "3 inches."

The angry ex-girlfriend surmises that "anybody who sleeps with him will notice. It's very noticeable. It's so tiny, tiny, tiny." Glassman, featured scantily-clad on Steppin Out's cover, adds that she "would laugh about it with my mom."

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But Gosselin didn't think it was very funny at all. "He said, 'You know how subconscious [sic] I am of down there,'" Glassman recalls. She admits she wasn't very sensitive about the topic. "I would tell him to his face, 'I don't think you would cheat on me because you're so small.' I would tell him that all the time."

"Having sex with Jon was bittersweet," she snipes.

Glassman and Gosselin parted ways — not so amicably — last December. The unemployed former reality dad is now dating Morgan Christie, 25. The new couple were spotted getting really affectionate at the Sundance Film Festival in Park City, Utah. "Tons of PDA, holding hands, kissing," an eyewitness said at the time. "Anyone who saw him remarked how inappropriate it was."

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