The "Touch My Body" singer will not only host the event at Nikki Beach Saint Barth, but she will perform as well.
Let's hope she rocks the house with her fan-favorite singles and holiday tunes.
The 48-year-old is also bound to wear some hot looks, fit for welcoming the new year.
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The luxury waterfront venue has rebuilt itself into a new and improved beach club since it crossed the destructive past of Hurricane Irma last year.
The club is a vacation hotspot for many A-list celebs so hopefully some will stop by to rock out with Mariah on December 31.
Are you looking forward to seeing Mariah sing it out on New Year's Eve? Sound off in the comments below!