Actor Robert De Niro is putting hip-hop mogul Jay-Z on blast for being rude and disrespectful, after Jigga agreed to do a song for his Tribeca Film Festival (a movie showcasing De Niro's 9/11 remembrance) but never answered the legendary actor's phone calls to talk about the song.

And recently, De Niro confronted the rapper at Leonardo DiCaprio's Birthday Bash held at Darby in New York City about not returning his six missed phone calls. Where many insiders at the party are claiming that the conversation got very heated, despite the private convo being heard by others at the A-List event.

According to Page Six:

“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. Bob wasn’t in any mood to make polite conversation,” the spy says. “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.” 

“De Niro kept telling him that he thinks he’s the man, but that he was disrespectful. Beyoncé came over, but that didn’t calm Bob down. It was the talk of the party. Everyone was saying there’s only one star in New York bigger and badder than Jay-Z, and that’s Robert De Niro. He can be quite scary when he’s angry.”

Jigga laughed at the issue at hand, but Robert was still pissed off at him. And the rapper's reps had this to say “low-key private conversation between two people that was apparently overheard. It was not a heated discussion.”