Jon Gosselin's new gal pal steamy sexy past!

RadarOnline.com reports that Hailey Glassman, 22, the daughter of estranged wife's plastic surgery tummy tuck doc was drunkenly trying to seducing bouncers, or having raunchy sex with other women in the restroom of the bar where she worked while she was in college.  And they have the pix to prove it!

A source says the former Indiana University student behavior was an ongoing "parade of horny, drunken hedonism."  Good thing it wasn't Ball State.

Not only but say hello to wild gay sex as well!

"Hailey hung out with the lesbian and bi-sexual crowd," the source divulged. "She and all her friend also went to a gay bar called Uncle E's, which is where the hipsters hung out. Her crowd was really sexual and slutty.

"Hailey was all over the place... she was hammered 90% of the time," the source added.

Just the kind of gal Jon would want for PR fueled wild wild weekends in St. Tropez before Jon & Kate Plus 8 returns after "hiatus".

Meanwhile Kate is said to be "furious"!