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An ex-boyfriend and former producer of Lady Gaga has filed a lawsuit against her, claiming the Grammy winner denied him royalty payments after their romance soured, The Associated Press reports.

In the $30.5 million suit filed Wednesday at a Manhattan state court, Rob Fusari says he was instrumental in transforming Stefani Germanotta into Lady Gaga, who dropped him when her career took off, he says. "All business is personal," the lawsuit said.

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