Is This Whitney Houston’s Last Performance? [VIDEO]

On Thursday night, Whitney hit up a Grammy party thrown by Gospel singer Kelly Price, and Whitney jumped onstage with her to sing a little bit of "Jesus Loves Me."

RadarOnline.com claims Whitney was there with her reported boyfriend Ray J and was pounding tequila. So when she saw Ray talking to "X Factor" contestant Stacy Francis, she went ballistic.

They, RadarOnline, have a source that claims Whitney "ran over to them and began screaming, 'This is my man! I'm a cougar! [B-word], get away from my man." Maybe Whitney wasn't as together as she claimed to be.