Charlie Sheen was at dinner with his fiancé when he heard Rihanna was going to be dining in the same restaurant. His fiancé is a huge Rihanna fan, so he sent a message to Rihanna's table asking if they could meet her.

Rihanna said no, saying there were too many paps around and it wasn't "possible at this time."

That set Charlie off on a huge Twitter rant, which you can check out here! (It's a doozy.)

Rihanna, of course, responds in the best way ever:

Don't mess with Rihanna!