(Photo : Reuters)

Jay-Z and Robert De Niro got into a fight at Leonardo DiCaprio's birthday party. Apparently, De Niro is upset that the "rude" rapper did not return one of his six phone calls.

According to the New York Post, sources at the party say that the rapper made his way over to greet the actor, but was immediately was given the cold shoulder by the actor. "Bob was sitting at a table, and when Jay-Z went over to say hello, De Niro told Jay that he never called him back," said a source.

At one point the rap mogul's wife, Beyonce tried to intervene and settle down the situation, which didn't work out to well. De Niro, wanted the rapper to do a song for the Tribeca film festival, but the rapper never answered any calls regarding further information about the project. Sources say, "Bob wasn't in any mood to make polite conversation,"the source added, "he told Jay that if somebody calls you six times, you call them back. It doesn't matter who you are, that is just rude."

Did Jay-Z get owned by De Niro?

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