Mariah Carey brought her baby bump out in NYC last night -- but she really wasn't showing it off.

Covered in a big red cloak, Carey performed her latest Christmas song "Oh Santa!" at the Rockefeller Center Christmas Tree Lighting on Tuesday night.

Of her pregnancy, Carey recently told "EXTRA" that she's "just about fruit for some reason" when it comes to cravings -- and refused to confirm rumors that she was having twins.

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