Lesson learned: Having an affair with your married boss can get you fired!

Weeks after admitting a fling with married director Rupert Sanders, Kristen Stewart has been dropped from a sequel of "Snow White and the Huntsman."

Sources say Sander's estranged wife, Liberty Ross, had warned him-- if he wanted to have any hope of saving their marriage he had better never work with Stewart again.

Meantime, Universal Studios has decided to shelve the scheduled "Snow White" follow up in favor of a "spin off" movie concentrating on Stewart's co-star, Chris Hemsworth's Huntsman character -- and not including Stewart at all.

A studio spokesman said, "The studio is currently exploring options to continue the franchise."

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