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Britney Spears is entangled in a raging dispute over the Bumble dating service ... TMZ has learned.

Britney's lawyer fired off a threatening letter to Adam Kluger, claiming he went behind Britney's back and negotiated with Bumble to fund her new music video.

According to the letter, obtained by TMZ, Kluger allegedly told Bumble he had authority to rep Britney for an $800,000 deal that would put the Bumble name all over her new vid. The lawyer says Bumble agreed and gave Kluger $200k up-front. Kluger then made a deal with Britney's label, RCA, to pay them $450,000 for the Bumble product placement promotion.

Britney's people say what Kluger did is fraudulent, because he never repped Britney. They also say his $350k fee -- more than 43% of the deal -- is ridiculous and way above what agents charge.

Kluger tells us he never told Bumble he repped Britney. He says his company is a creative agency that puts people and companies together, which is exactly what he did here. He also said his company has worked with Britney before on projects involving Orange Theory and Plenty of Fish.

Kluger also says he's on the Forbes List of the 30 Most Influential People in Music Under the Age of 30. Kluger's lawyer tells us, "We are going to defend the sterling reputation of The Kluger Agency in court as necessary. The allegations are false. The Kluger Agency has done nothing wrong."

Ever wonder what an $111 million NBA contract looks like?

Well, here you go ... courtesy of Gilbert Arenas.

Chris Martin and Gwyneth Paltrow are 'consciously' deciding to thrust their kids into the spotlight to show off their musical talent ... and this video explains why they're doing it.

12-year-old Apple and 10-year-old Moses performed at a Boys & Girls Club fundraiser in Malibu, which looked like it was in someone's backyard. She sang Ariana Grande's "Just a Little Bit of Your Heart" and he sang "House of Gold" by Twenty One Pilots.

It's pretty remarkable -- not only because the kids clearly have their parents' musical talent -- but because Gwyneth and Chris usually try to keep 'em out out of the public eye.

Judge Judy was less than amused when our photog asked who's gonna don the doily after she hangs it up.

The most famous judge in America was leaving Craig's in WeHo Monday night, when our photog asked about a succession plan ... clearly not understanding the name of the show is "JUDGE JUDY."

Johnny Rotten made the Sex Pistols punk rock pioneers, and was frequently covered in bodily fluids while he did it ... but that was the 70s.

Johnny's trademark spiky hair -- and just about everything else about him -- has made a huge transformation in 2016.

Toni Braxton won't let lupus derail her from tour ... she performed over the weekend with a heart monitor strapped to her chest.

Toni's "The Hits Tour" hit Savannah, Georgia Saturday night where she busted into song with with the monitor in plain view.

We're told doctors urged her to wear it 24/7 to detect chest pain, as well as oncoming heart attacks or strokes.

Toni was hospitalized twice this month ... the result of complications from the autoimmune disease.

She still sounds amazing.

BTW ... Birdman was front and center at Saturday night's concert.

Matthew McConaughey is already teaching his son, Levi, how you just gotta keep livin' man, L-I-V-I-N ... the healthy way.

The two went for a mile run while on vacation in Honolulu, where the elder McConaughey was promoting the military's "Rock the Troops" concert over the weekend.

Levi, who's 8, barely broke a sweat, but can't say the same for Matt. He just keeps getting older, but the ...

DMX sang a song of gratitude to the Yonkers, NY cops who saved his life earlier this year ... and performed for free at the charity boxing event as a token of appreciation.

X was at the Yonkers PD vs. Fire Dept. "Toughman Competition" Friday night ... giving a rousing speech about the officers who found him last February lifeless in a parking lot.

DMX boosted the energy up to electric levels at the event, helping them raise $80k. The hometown rapper performed "Ruff Ryders' Anthem" to a crowd of 2,000 ... and they loved it.

Kendall Jenner can only breathe a very small sigh of relief ... the man accused of following her up her driveway has been convicted of trespassing -- but got off on the stalking charge.

Shavaughn McKenzie's verdict just came in ... and the partial verdict is troublesome to the famous Kardashian.

Here's the problem ... McKenzie will almost certainly get probation for trespassing ... the less serious of the 2 charges. And, he seems obsessed with Kendall.

Gilbert Arenas says he's NOT REALLY struggling financially -- despite what he said in court docs -- claiming he's still extremely loaded and hiding his fortune from his baby mama.

We broke the story ... Gilbert filed court docs in his family law case saying his $111 million NBA contract pays out on Oct. 31st -- and once that day comes, he won't be able to afford to pay for his kids' expensive private school.

In the docs, Gilbert makes it very clear he'll be living on interest from previous investments -- and not rollin' like a $160 MILLION baller.

But after TMZ Sports posted the story ... Gilbert posted a video of his own -- showing off his kids messing around with thousands of dollars in cash and bragging that he's "hiding" it from his baby mama, Laura Govan.

Gilbert also shows off his kids' safety deposit boxes and says they're "gold digger proof."

He also says if Laura is insistent on sending the kids to school she better start "selling that p**sy."

#StayClassy

Lady Gaga's giving construction workers something to whistle at -- or in this case ... something to drool over.

Gaga was out in NYC Monday, strolling down the street and going about her business in some rather high-rising Daisy Dukes.

Tobey Maguire could use a shave, because he looks like he has more important things on his mind.

The actor ventured out in L.A. Monday ... the first time he's been seen since announcing he and his wife were splitting up after 9 years of marriage. Spidey's still wearing red these days -- but gym shorts aren't quite as cool.

Maguire's ex, Jennifer Meyer, was seen out in public last week ... and she seemed pretty chill.

Donald Trump says his latest accuser is no saint ... and he sounds certain she's been grabbed plenty of times in her line of work.

The Donald went on WGIR radio's "New Hampshire Today" and sarcastically said he was sure porn star Jessica Drake has "never been grabbed before." Drake claims Trump grabbed her, kissed her and solicited her for sex in 2006.

Trump says her claims and the allegations of the other accusers are BS.

Drake launched an online sex shop just before going public with her allegations -- but her lawyer, Gloria Allred, says the timing was a coincidence.

T.I.'s wife, Tiny, wasn't disrespecting her hubby by posing for a photo with Floyd Mayweather ... she was doing it out of respect for Mariah Carey.

We talked to Tiny about the awkward photo op with Floyd taken over the weekend at Mimi's Halloween party, and she explained how she was almost railroaded into standing next to a guy who does NOT get along with T.I.

Tip and Floyd have had beef since their 2014 brawl outside a Fatburger on the Vegas strip.