Mariah Carey, ever the business lady, has snapped up an unmissable chance to keep her catchy Christmas tune All I Want For Christmas Is You in the charts for years to come.
It's 17 years since the jingle was first released and, since then, we've seen Carey prance around as Mrs Santa more times than we can count.
But now the songstress has decided to give her popular festive offering a very contemporary update.
And who better to bring in millions of screaming new fans, plus their cash, than Justin Bieber?
Beliebers are no doubt tweeting frantically back to JB as we type, as he earlier teased the duet on Twitter: "Hmmmm....u really wanna know huh....maybe it is time i tell you."
He then posted a video which featured Carey on a roof top, announcing the pair's upcoming collaboration.
While she showed off her best bling, Carey revealed: "Justin and I are doing this duet together and it's my song All I Want For Christmas Is You, which I wrote and produced.
"I'm very excited about it and I think a lot of you are very surprised by this and you're going to be even more surprised when you hear it because the song sounds great."
The collaboration will feature on the star's upcoming Christmas album Under The Mistletoe, which is released on November 1.