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Actor and rapper Machine Gun Kelly broke an exclusive contract with his manager — whom he started an entertainment company with — and he has refused to sign a lucrative merchandise agreement, according to a new lawsuit.

Entertainment company Est 19xx LLC was started by the musician — whose given name is Colson Baker — and business partner and entertainment lawyer James McMillan, who helped broker a record deal with Interscope Records in 2011, according to the new Manhattan Supreme Court lawsuit.

The 29-year-old “Rap Devil” rhymer sold millions of albums with the help of McMillan — who also got a merchandise deal that had the potential to “sell millions of dollars in retail and tour merchandise around the world,” the court papers say.

But by 2018 Baker — who had a role in the Netflix movie “Birdbox” and is pals with “SNL” star Pete Davidson, had started doing business under a separate company called MGK Media Group LLC, the court documents claim.

Est 19xx, and subsidiary company Make Millions Music LLC, also stand to lose $800,000 if Baker doesn’t honor a merchandise deal which is set to expire soon and that has been pending since last summer, the lawsuit alleges.

Est 19xx says that Baker is required to start arbitration under the agreement but has instead “refused” claiming the agreement and arbitration clause “are not binding, even though all the parties have been operating under the agreement for the past seven years,” the court documents allege.

A rep for Baker did not immediately return a request for comment.