Mariah Carey has a brand new piece of jewelry -- a massive engagement ring -- 'cause her billionaire boyfriend James Packer just popped the question ... and Mariah said YESSSSS!!!!
It all went down in NYC -- where Packer secretly rounded up a bunch of Mariah's close friends for a private dinner at Eleven Madison Park ... so he could get down on one knee and propose in front of the most special people in her life.
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