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Floyd Mayweather is giving Santa Claus a run for his money -- he dropped more than $250,000 in New York City this week on platinum, gold, and diamond encrusted gifts for his family and friends.

TMZ Sports spoke with AVI, Ofir, and Richie -- the guys at Pristine Jewelers and Leon Diamond in NYC -- who tell us Floyd came in after hours Wednesday night ... right after his infamous Saks Fifth Avenue bathroom incident.

Among the gifts: a diamond tennis necklace with 70 carats of diamonds and a matching tennis bracelet, a diamond encrusted watch with over 40 carats of diamonds, and a diamond pendant -- just to name a few.

We're told each piece Floyd picked out ran between $5,000-$10,000.

Merry freakin' Christmas.

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Justin Bieber was caught speeding in the valley and it's cost him thousands ... which is just how he planned it.

Biebs was down for a little late night go-kart action Wednesday night for a bud's b-day ... and dropped a few grand for an after-hours, all-access adrenaline session at MB2 Raceway.

We're told ... JB arrived with a dozen friends -- including Hailey Baldwin. We're told he dropped $2,700 ... the cost of burning rubber for 2 hours.

The staff gladly stuck around ...  Justin threw them an extra $500.

Go Biebs Racer ... Go!

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The ex-boyfriend of Nicki Minaj is taking their break-up INCREDIBLY hard ... to the point he's having suicidal thoughts.

Safaree Samuels is confiding in friends that he's an emotional wreck over his breakup with Nicki after a 12-year relationship. He's become a shut-in, spends days and nights smoking weed, and has talked openly about suicide.

Safaree is telling friends he won't get in touch with Nicki because she's now hooked up with Meek Mill. He says it's torture for him, because he believes Meek Mill destroyed his relationship with Nicki over false claims he cheated.

Safaree's friends say they're scared these are more than idle threats. They've urged him to see a shrink. The problem ... he's seeing one whom he says has been giving him meds that make him even more emotional.

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A 35-year-old Swedish video game programmer just got the prized house that Jay Z and Beyonce also wanted ... TMZ has learned.

Our real estate sources tell us ... Markus Persson plunked down $70 million cash for a 23,000 square foot palace in Bev Hills.

Markus can afford it ... he sold his company, Mojang -- which created the video game Minecraft -- to Microsoft for $2.5 BILLION.

As we reported, Beyonce and Jay Z visited the house multiple times and made an offer but Markus beat them out at 70. 

The other winners ... realtors Branden Williams and Ben Bacal who get a big fat commission check.