Here's a tip for guys: Don't invite Joe Jonas to serenade your girlfriend when you're going to propose. Especially if you don't want it to end with a slap!
Joe teamed up with Funny or Die for a funny Valentine's Day video where he "helps" a guy propose to his girlfriend.
But the dinner ends with a slap in face — given by Joe! Looks like this JoBro can hold his own!
Watch the "Joe Jonas Valentine" below!