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Lil Wayne Buys Hidden Hills Palace for $15.4 Mil ... 'Sup Kylie???

Lil Wayne's in luck if he ever needs to borrow a cup of sugar from his neighbor, because he just dropped a fortune on a mansion right by Kylie Jenner's crib.

The rapper dropped $15.4 mil for the home in Hidden Hills -- the high-profile gated community that's home to much of the Kardashian crew -- according to sources familiar with the deal.

The 12,135 sq. ft. home looks awesome -- it's a brand new custom estate with 7 beds, 7.5 baths, and a bright, open floor plan with panoramic views.

The interior comes with all the luxurious bells and whistles you can imagine -- chef's kitchen, breakfast room, refrigerated wine display, piano area, entertainer's lounge and a home theater.

Outside there's a pool, a basketball court, multiple patios with seating and a 1-bed guest house ... and it all sits on 3.26 acres.

The place was listed for $15.75 million ... so, Wayne got it at a lil discount too.

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