Justin Timberlake was introducing Madonna at a ceremony at Hall of Fame on Monday, and he saw the opportunity to diss Britney Spears a tad!

He said:" The world is full of Madonna wannabes, and I might have dated one or two of them."

"Madonna took her time to kiss someone, who I might have kissed in public!. By that you obviously all know that I'm talking about Sean Penn!"

That's a bit cruel Justin, even as a joke! We all know Britney is not a wannabe, she is in fact a has-been! (kidding, I love Britney)