Mariah Carey is ready for the beach!

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The new mom squeezed into a black one-piece bathing suit today, posting the above photo just moments ago on her Twitter -- saying "Ocean work out! It's been a loooong time since I've been in the ocean."

Carey, who gave birth to twins back in April, hit the surf for the first time since having a baby, showing off her slimmed down frame.

Lookin' good Mimi!

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