Rihanna & Chris Brown Caught Making Out!

Is Rihanna giving Chris Brown a second chance???

Just one week after the 23-year-old singer appeared to cozy up with Nicole Scherzinger, Brown got hot and heavy with his former girlfriend while partying at NYC hot spot Griffin.

Brown, joined by pal Bow Wow, arrived at the club first and settled into his own table, E! News confirms. Rihanna arrived later, and sat at a separate table from her ex.

"She knew he was there," a source says.

At one point during the night, Brown climbed over his table to join Rihanna at hers. She then proceeded to take off his shirt before they began dancing and making out, according to an eyewitness at the club.