Justin Timberlake’s gone puss-swapping — he’s supposedly dumping girlfriend of three years Jessica Biel for singer Rihanna. Star Magazine says

After a hot grinding session at 1Oak’s MTV Video Music Awards bash in NYC, RiRi and JT moved to her hotel room, where they had a steamy, private after party! “Rihanna and Justin have been talking and texting on the phone nonstop since the VMAs,” said a source.

“Then at [the studio where the two are working on Rihanna’s new album], Justin was joking about strippers. He said she needed to entertain him like that. So Rihanna gave him an impromptu lap dance!”

Justin has made it clear he is 100 percent into Rihanna, and she equally feels the magnetic attraction, says a source. “She is a total tease and loves flirting with him. She digs him and wants to date him too!”

Well, as long as he doesn’t bash her face in or bite her, he’s already doing better the last guy. That’s the great thing about battered women. They set the bar so low!

Rihanna in Venice: