Jay-Z’s got 99 problems, and Robert De Niro just became Problem #100.

In the 21st century we’re so used to celebrities’ Twitter sniping that we forget it’s even possible to have an honest-to-god face-to-face feud anymore. So thank you, Bob, for the reminder.

Supposedly, Jay-Z promised to record a song for the Meet The Parents star’s Tribeca Film Festival. Robert then phoned Jay-Z six times to follow-up, but Hova was apparently too busy to return the calls.

Ouch! Ego bruised, Robert walked up to Jay at Leonardo DiCaprio’s birthday party, according to Page Six, and called him “rude” and “disrespectful.”

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Now, in terms of celebrities we’d find intimidating when they get in our face, Jay-Z and Robert De Niro are both pretty high on the list, so we can only imagine how tense this confrontation must have been. Apaprently Beyonce attempted to talk the Oscar-winning star down, but he wsn’t having it.

And if not even a chat with Queen Bey can smooth things over, what can, really?

This is one case in which De Niro’s signature line “You talkin’ to me?” can be answered with a  resounding “No.”

Do you think Jay and Bob will ever make nice?

Photos Courtesy of Fameflynet