Mariah Carey is making pop history again.

The star's All I Want For Christmas song is the first holiday song to top both the U.S.-based Hot 100 and the Official UK Singles chart.

The hit, first released on the singer's 1994 Merry Christmas album, officially topped the UK charts on Sunday and on Monday, Billboard announced the track had returned to the top of the US singles chart.

Not only that, but the song started 2020 at number one in America, reaching the top spot for the first time in December 2019 and staying there for three weeks, and now looks certain to end the year the same way.

Mariah, 50, tweeted her excitement and thanks to her fans on Monday after posting a festive video to Instagram hours earlier, acknowledging her UK chart success.

'WOW! I truly wasn't expecting this at all!!' Maria tweeted.

'Eternally grateful for the enduring success of this song. "I don't want a lot for Christmas..." just wishing for a bit more JOY and some holiday spirit for all, especially this year. Merry Christmas! Love, MC.'

'Christmas' also ties the most time at number one among holiday hits in the Billboard chart's 62-year history.

In December 2019, Amazon Music posted a short video in which Mariah explained why the festive season is so important to her and how she created her famous holiday song.

'I have such an emotional connection to Christmas,' she shared. 'And it wasn't about the gifts.'

'It was just about the hopefulness of the holiday season and just feeling, like, in the spirit, and the need for me to express myself and make a song that made me feel happy at the holidays,' she said.

'It's grown in popularity over the years, and that's the thing that's amazing to me about this song,' she added.

Mariah also stars in a Christmas special for Apple TV+ with guests Ariana Grande and Jennifer Hudson.

The trio perform a new version of Mariah's Oh Santa! as well as a new mix of All I Want For Christmas in the special which premiered on December 4.

Both songs are included on the soundtrack to Mariah Carey's Magical Christmas which is currently at number 28 on Top Holiday Albums and number 99 on the Billboard 200.