Page Six reports:
[Image via WENN.]
This is the sweetest thing.
She wasn't the only one in shock, though. Listen to the audience go insane!
Although we're not sure why he decided to sing the break-up classic, Cry Me A River, we still think the whole thing was pretty cute.
He does not sound like a little guy anymore. He is a man!
Watch the video and see for Urself!