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Hillary Busis
August 06, 2012 AT 06:53 PM EDT

Sharon Osbourne’s decision to leave America’s Got Talent was news to NBC: “This is coming out of context and sort of spontaneously, and we don’t even know what’s going on,” NBC Entertainment Chairman Robert Greenblatt told the AP after Osbourne announced her departure in July. Today, the New York Post revealed Osbourne’s true reason for leaving her judgeship — she and the Peacock have been engaged in “a nasty dispute” since June.

The quarrel supposedly centers on Osbourne’s son Jack. According to the Post‘s Sean Daly, Jack was in talks to participate in Stars Earn Stripes, an upcoming NBC reality show in which celebrities compete in events inspired by military exercises. Daly writes that the network cut ties with Jack after he was diagnosed with multiple sclerosis two months ago. (Jack made the same claim during a June appearance on The Talk, his mother’s daytime series.) The network’s move infuriated Osbourne, driving her to leave the talent competition she has judged for six seasons.

“I just can’t be fake,” Osbourne told the Post. “It’s discrimination, and it was badly handled.”

Stars and Stripes producer David Hurwitz told the Post that while his team was in talks with Jack Osbourne, they never formally hired the former Osbournes star. Additionally, Hurwitz expressed doubts that Jack would have been able to participate in Stars had he been signed: “The rigors of the show were too intense for him,” Hurwitz said.

A rep for Sharon Osbourne had not responded to EW’s request for comment at press time.

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