And it happened right in the middle of her “freaking nap”.
“As soon as we were made aware of the issue, we locked the compromised account and are currently investigating the situation,” a Twitter spokesperson told The Hollywood Reporter.
CNBC estimates the hackers had control over the account for around 30 minutes.
The tweets were deleted, and Mariah returned with a typically understated response to the whole debacle:
Despite the hack, Mariah ends 2019 and begins 2020 in a very familiar place: as the reigning queen of pop music.
Her latest accolade also makes Mariah the first singer to have a number-one hit in America in four different decades.
To mark the 25th anniversary of her festive hit, Mariah went all out, sharing a number of suitably-ridiculous viral videos on social media in the song’s honour, as well as a new ad campaign for Walkers crisps, which heavily featured the track.
Near the end of the festive season, Mariah also appeared in a brand new music video for All I Want For Christmas Is You.