Beyonce Sued -- You Stole My 'XO' Song ... Now Kiss My Ass!

Beyonce's kisses have gotten her sued.

A background singer named Ahmad Javon Lane claims he wrote a song called "XOXO" and shared it with another singer who does background vocals for Beyonce.

It's a short story. He says in his lawsuit the song ended up in Beyonce's hands and she ripped him off with what he says is a copycat song, "XO."

He wants at least $3 million.

Gotta say ... we don't hear it, but you decide.