Robert De Niro allegedly picked a fight with Jay-Z last weekend
The `Godfather II` actor called the rap mogul out for being disrespectful in front of a collection of A-list guests including Martin Scorsese and Cameron Diaz at Leonardo DiCaprio`s 38th birthday party, accusing Jay-Z of never returning his calls.
A source told the New York Post newspaper: "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. 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."
The argument was over a song Jay-Z had agreed to record for the Tribeca Film Festival, but the superstar rapper never got back to fellow Tribeca resident Robert with details about the track.
Jay-Z`s wife Beyonce Knowles - with whom he has 10-month-old daughter Blue Ivy Carter - attempted to diffuse the situation, but onlookers were amazed to see "scary" Robert put the rap star in his place.
The insider added: "When Jay-Z tried to make a joke of it, saying he is terrible on the phone, De Niro kept telling him that he thinks he`s the man, but that he was disrespectful.
"Beyonce 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."
However, a source close to the 69-year-old actor insisted the bust-up was simply a firm "conversation".
They commented: "It was a low-key private conversation between two people that was apparently overheard. It was not a heated discussion."