It's one of the most popular Christmas songs of all time and now All I Want For Christmas Is You is being turned into a film.
Mariah Carey announced the news on Twitter to her 17.6 million followers.
She wrote: "My song is becoming a movie! You're the first to hear about this exciting news".
It will be out for the Christmas holiday season at the end of the year and will be called All I Want.
In it she lies on a sofa in festive pyjamas stroking a small Jack Russell dog who seems to be trying to run away.
There's also a clue to what the animated film will look like in the shape of a copy of her book version of the song.
On the cover is a girl who looks like a young Mariah holding a similar dog to the singer standing in a snow filled field surrounded by white topped pine trees.
The timing of the announcement was not lost on some of her fans.
Others could not contain their excitement and mild confusion.
It will be produced by Universal Studios Home Entertainment and looks unlikely to get a full cinema roll out.
The singer narrates and produces the film and she seems pretty excited.
"I am thrilled to be able to bring the story of the song to new generations of families."
The story of the film will follow her book called All I Want for Christmas is You.
In it a young Mariah sees a puppy named Princess at the pet store and suddenly knows exactly what she wants for Christmas.
She then has to prove she can look after the badly behaved dog called Jack.
The song was originally released in 1994 and has sold more than 14 million copies.
In 2016, more than two decades later, it was the year's most streamed holiday single.