sosbourne230080612.jpg You don't mess with Sharon Osbourne's brood and expect to get away with it!

The America's Got Talent judge just quit the NBC show after seven seasons because she claims her son Jack was fired from the new reality show Stars Earn Stripes after the network learned of his multiple sclerosis diagnosis.

"I just can't be fake. It's discrimination, and it was badly handled," Osbourne told the New York Post about her dissatisfaction with the network.

After fighting bitterly with NBC executives, The fiery redhead pulled the plug on her involvement with the show and will now have to pay a penalty for breaking her contract, but she insists the punishment is a small price to pay for justice.

"All they can do is stop me from being a judge on another network for five years," she explains of the repercussions to her abrupt exit.

For their part, NBC has denied ever firing Jack, and states that although they were in talks for the show, no agreement had ever been signed. "Sharon has been a valuable part of the NBC family. We regret any misunderstanding and wish Jack well," an NBC rep told the Post.