Khloe Kardashian and Rashad McCants break up!

It's all over between Khloe Kardashian and her boyfriend, Minnesota Timberwolves guard Rashad McCants.

On Tuesday, Khloe told visitors to her Web site, “Rashad and I are still very much together.” On Wednesday, however, while on a trip to Minneapolis to watch Rashad play, she discovered that he’s been cheating, an insider tells Life & Style.

“Khloe was devastated when she discovered evidence that Rashad was cheating with girls online," the insider says. “She confronted him, and he reacted angrily and tried to deny the story at first before admitting that it was true. He’d been hooking up with girls over Facebook for the past two weeks.”

Khloe immediately flew back to LA.

Khloe and Rashad, both 24, had been dating for six months. “I was so shocked; I thought I was in a committed relationship,” Khloe tells Life & Style. “I'm a little upset today, but I'll get over it. I'm going to Tampa tomorrow with my sisters to host Super Bowl parties and we are going to party the pain away.”