The billionaire heir to a Colombian beer fortune used a business partner’s connections to become a famous DJ, then cut him out of a lucrative deal on a Florida music festival, a $37.8 million New York lawsuit claims.

Julio Mario Santo Domingo III is being sued in Manhattan by Herve Larren, who alleges that the scion persuaded him to quit his job to help him realize a dream of becoming a disc jockey and “elite brand name in music, social enterprise and philanthropy.”

Larren says in the civil lawsuit that, as a former manager at Louis Vuitton-Moet Hennessy, he had a network of rich friends and celebrities that was coveted by Domingo, whose the stage name is “Julio Sheik n’ Beik.”

Domingo’s namesake grandfather was a Colombian magnate whose estimated $8.5 billion fortune made him one of the wealthiest men in the world. He had owned the Bogotá-based Bavaria Brewery before selling it to the brewing giant SABMiller. He died in New York in 2011 at age 87.

The 30-year-old Julio Mario Domingo III is worth $2.5 billion, yet Forbes gives him a rock-bottom Self-Made Score of 1, meaning that he inherited his fortune and has done little to increase his personal wealth.

Domingo and Larren, who has an MBA from Columbia University, formed Sheik n’ Beik Entertainment in 2013.

Larren, 36, says he “exceeded [Domingo’s] expectations” by securing DJ gigs in Ibiza, Paris, London and Monaco.

But then when the partners were on the brink of securing a lucrative investment in a popular music festival in Okeechobee, Fla., Domingo fired Larren, accusing him of embezzlement, an allegation he denies.

Larren claims Domingo colluded with his uncle Alejandro Santo Domingo to push him out of the company so they could reap all the rewards from the music-festival deal.

He was canned last August.

Domingo sued Larren in October, accusing him of blowing $1.8 million he loaned him to finance a startup company on his “extravagant lifestyle.”

Domingo alleged that Larren was supposed to use the money to launch an online charity auction company called BidKind. Instead, Larren charged BidKind’s corporate credit card for $21,000 in taxi and Uber rides, $24,000 at restaurants and $4,000 on clothes, according to Domingo.

Larren denies the splurges and adds in his own suit that Domingo used their company funds for a multimillion-dollar art collection, including a Keith Haring piece that hangs over his desk, a luxury villa with a private chef in Ibiza in 2013 and tickets to Cartegana for his family.

Domingo’s attorney, Jessica Catlow, said Larren’s suit is “full of factual inaccuracies.”

“I think Mr. Larren’s lawsuit today is what you do when you don’t have a defense,” Catlow said.