Metro

Rihanna an NYC baller buster

Rihanna is making the jump from pop star to basketball commentator.

An angry RiRi went on a profanity-filled rant yesterday, declaring that Knick guard J.R. Smith has been playing poorly in the playoffs because he is partying too much.

“He f–king up cus his ass be hungover from clubbing every night during the playoffs!!” she wrote to a follower on Instagram, according to the Larry Brown Sports Web site.

Rihanna — pictured here outside her Manhattan hotel yesterday — made the accusation after a fan commented on a photo of her at a nightclub with Smith.

He must have gotten the message: He scored 13 points to help the Knicks beat the Indiana Pacers, 85-75, last night.

After the game, he scoffed at the diva, saying, “I’m not worried about Instagram. I’m worried about the playoffs.”