{blackbabes} Mariah Carey -- Hangin' Out with Brett Ratner On His Birthday!

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Mariah Carey celebrated the birthday of her boyfriend, King Brett Ratner Saturday ... aboard the USS Rich People.

TMZ broke the story ...Mariah and Brett are in full-blown couple mode, sailing around the Bahamas on a mega-yacht owned by one of Brett's billionaire friends.

It's interesting ... these 2 have been friends for a number of years and worked together on Mariah's music videos as well. But it's clearly turned into a lot more.

Nice to see her happy.

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