Well, that's pretty much what happened last night.

A group of ladies were singing away at Night Club "Sing Sing" in Miami when in walks Beyonce and Kelly....who happened to be in the next room and hear two girls singing Beyonce's "Party" and they wanted to see what was going on.

Check out the pic that was posted of the memorable night

There's more to the story too. Click HERE to see what else happend last night.