A new song by former onesie wearer Jessie J has leaked all over the internet.
'Crazy 'Bout You' was written by Diane Warren and is taken from the forthcoming film, Silver Linings Playbook.
Jessie 'took to Twitter' to chat about the song, or at least explain where on earth it's come from.
"So… :) @Diane_Warren was asked to write the leading soundtrack song for a new movie called #SilverLining and so @Diane_Warren wrote #crazyboutyou…Then.. @Diane_Warren asked me to sing It for the movie *happy dance* obvs I said yes :D," she explained.
Mind you, having started all the excitement, she then added: "I must break it to you all this song isn't supposed to be out yet its been leaked. So all your q's I have no answers too at the moment :)"