All eyes were on superstar Mariah as she made her way into the Ed Sullivan Theatre in New York City on Wednesday afternoon (7 May).
Mariah, 44, oozed glamour in the floor length-sequin dress, which she teamed with a black leather jacket and oversized sunglasses.
It appears Mariah was running a little behind schedule though, as she posted a photo on Instagram ahead of her appearance, saying: "Rushing.. Dave, I'm coming dahhling! @letterman."
The mum-of-two, who is married to America's Got Talent host Nick Cannon, was all smiles as she left the studios and greeted fans with a wave.
'Heartbreaker' singer Mariah appeared on the US chat show to talk about her new album, Me. I Am Mariah... The Elusive Chanteuse. She announced her album details via Twitter last week, explaining that her collection of work is a "personal treasure".
The album, which is due for release on 27 May, is a follow-up to her 2009 release, Memoirs of an Imperfect Angel.
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Watch Mariah's video for 'We Belong Together' below: