Well, two big names would you to know that it was not either of them.
"That's ridiculous and an outright lie," Paris Hilton told Radar Online when asked about reports that she was after Chris earlier in the evening.
"I was not 'all over him' as some magazine reported. I said, 'hello' and that was it. I love Rihanna and that never happened," Paris swore.
Also clearing her name is Leona Lewis, whose rep told Access Hollywood, "Leona was at Clive Davis' Pre-Grammy party with her family and boyfriend and had nothing whatsoever to do with any argument that may have ensued between Chris and Rihanna. Any allegations that the pair had flirted are completely false."
So, if it wasn't Paris and it wasn't Leona, who was it? Was it even a star? Or just some groupie?