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Shannen Doherty

Shannen Doherty's reputation and relationship with her costars while filming Beverly Hills 90210 was so bad she got fired, and everyone else was thrilled about it — castmate Ian Ziering especially. "I'm pretty happy she's gone actually," he told EW. "Just a total lack of professionalism." The same thing happened on Charmed, where Doherty left due to reported strife with Alyssa Milano.