Rihanna and Chris Brown spotted getting cozy at an NYC club

Rihanna and her ex-boyfriend, Chris Brown, can't seem to stay away from one another.

The two were spotted Monday night (Oct. 1) at New York nightclub Griffin, and according to several reports they did more than just exchange hellos.

Per E! Online, Brown and his buddy Bow Wow were already at the club when Rihanna arrived and sat at a separate table. Brown eventually joined her, and they then began "dancing and making out," according to a fellow clubgoer. They then left separately about 4 a.m. Tuesday.

PICS: Rihanna on- and offstage

The New York Daily News also reports that Brown was spotted leaving the Manhattan hotel where Rihanna is staying -- before going to pick up his current girlfriend, model Karrueche Tran. She is reportedly not happy about Brown cozying up to his ex and may have referred to the situation in a couple of tweets.

"There's a difference between a man and a boy," she wrote Tuesday. "I prefer men." Then just after midnight on Wednesday she reiterated, "Remember I said I prefer men."