Of course Mariah Carey has had number one hits before, but not for her beloved Christmas song, "All I Want For Christmas Is You."
The holiday classic was released 25 years ago but it didn't top the hot 100 chart until this year.
The song has been covered by artists including Ariana Grande and Ceelo Green.
And it was also the magic behind one of the most heartwarming scenes in "Love Actually."
Despite only topping out at number three until now, Carey has made 60 million off royalties from the song.