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Mariah Carey doesn't waste time ... just days after she hopped on a yacht with new billionaire BF James Packer, they're already talking marriage. 

Our Mariah sources say it's insane ... they've been "dating" for just a matter of days, but he's already told her he wants to marry her, sooner rather than later. The soonest can be when she's officially divorced from Nick Cannon. But we're told Mariah is open to tying the knot with James.