Chris Brown Under Fire For What Some Say Was Lip-Synching

Everyone's still talking about Chris Brown's performance at the Billboard Music Awards.

It certainly looked, and sounded, like he was lip-synching.

Before Brown even left the stage, Joe Jonas of the Jonas Brothers took to Twitter, asking: "What happened to people singing live?"

Pink also tweeted: "One day if I lip-synch I hope to do it as well as him."

But a defiant Brown is shouting down his critics with his own tweet: "Don't hold ya breath waiting for me to stop doing me!"