Hell hath no fury like a woman scorned -- just ask Jon Gosselin.
RadarOnline.com has discovered that Gosselin's ex gal pal Hailey Glassman has posted on Twitter an explicit photo that takes a direct shot at Jon's manhood.
In the photo, you see a man's exposed private parts with a ruler next to it to illustrate the man's 'shortcomings'.
Under the pic is a tasteless Tweet in which she says in part: "yes you know wh this...belongs to.I think I just threw up in my mouth a bit. EW the torture!
Glassman and Gosselin briefly dated after his break-up with his now ex-wife Kate. Since then, Jon has accused Hailey of trashing his New York apartment-- a charge she denies.