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Rob Kardashian's been using his time out of the public eye to focus on his health and drop some pounds ... and a lot of it's thanks to saying no to alcohol.

The Kardashian bro was spotted in Kim's Instagram Story from her birthday celebration Monday night, clearly looking a lot leaner than he used to.

Sources close to Rob tell TMZ ... he quit drinking recently and has been focusing on making better diet choices -- including cutting down on fast food. We're told he's also exercising on the reg and playing a lot of basketball to get in shape.

All of this combined has led to him shedding a lot of weight -- our sources say in the ballpark of 20 lbs. ... maybe more compared to a couple years ago.

We're told Rob's in the best place he's been mentally in a long time too ... fully devoted to raising his daughter, Dream, and making sure she's growing up happily.

Along with this positive development, Rob's also managed to avoid any dust-ups with his baby mama, Blac Chyna, for the past several months ... and that's good for everyone's health.

As for Rob's sister's 39th birthday party ... it was pretty sweet. The fam got a "home cooked meal" from Carousel Restaurant -- which cooks up Middle Eastern cuisine -- and Kim was showered with gifts.

Ronda Rousey absolutely DESTROYED her real-life husband, Travis Browne, in an underground fight club on Monday ... and it was all for an episode of the show, "9-1-1."

Ronda is a regular cast member on the FOX hit -- and this week Ronda's character, Lena, brought her firefighter coworker, Eddie, (played by Ryan Guzman) to a parking lot fight club to work out his anger issues.

But, Ronda wasn't a spectator, she was there to fight -- and her opponent is a giant, bearded tattooed man ... whose face you never really see.

But, when we slowed down the tape, it was obvious that dude is Browne -- a 6'7", 250-pound former UFC fighter!!!

The fight doesn't go too well for Browne ... Ronda's character easily ducked a few punches before hitting him with a flying knee.

She followed up with a superman punch, slammed his head against a truck, hit him with a judo throw and then obliterated his face with some elbow strikes from the top position.

All in all ... pretty good stuff!!!

Remember, it ain't all glitz and glamour for Rousey ... who seriously JACKED UP her finger in real life while shooting a scene for the show earlier this year.

As for Browne, he was 18-7 as a pro-MMA fighter -- with wins over guys like Matt Mitrione, Fabrício Werdum, Brendan Schaub and Alistair Overeem.

A bizarre ending in the Jon Jones strip club vagina slap case -- the UFC star pled no contest to disorderly conduct ... but officials say they couldn't prove Jon actually did what he's accused of doing!!!

Remember, a waitress at TD's Eubank Showclub in Albuquerque told cops Jones had slapped her in the vagina during a wild April 19th night out with his NFL star brother, Chandler Jones.

The woman claimed Jon came up from behind her that night and put her in a "tight rear-naked choke hold" and then lifted her up in the air in what felt like a "wrestling match."

Once he put her down, the woman claims Jon slapped her right in the genitals.

Jones was initially charged with misdemeanor battery -- though he ADAMANTLY denied all wrongdoing and pled not guilty at the time.

Cops investigated the allegations and interviewed "numerous independent witnesses" -- but NOBODY could corroborate the woman's allegations.

In fact, cops say they tried to work with the accuser -- but she stopped cooperating with law enforcement during the investigation.

Ultimately, the Bernalillo County DA's office tells TMZ Sports, "There was not enough evidence to proceed with the petty misdemeanor charge of battery under New Mexico state law."

Canadian mountain bike legend Jordie Lunn died after a biking accident in Mexico earlier this week ... his family announced on Friday. He was 36.

Lunn -- a BMX racer and free rider -- was trail riding in Cabo with his friends when he got into an accident and suffered a fatal head injury.

"Jordie lost his life doing exactly what he loved," Lunn's family said in a statement to Pinkbike.

Lunn was also well known for his crazy biking videos ... with some clips getting millions of views on YouTube.

"Jordie had an incredible 20+ year career as a mountain biker," his family continued. "He will always be cherished for his heart and love that he gave to his family, friends, and fans, as well as the incredible talent that he had on his bikes."

Antonio Brown has such a great relationship with the police in Hollywood, Florida ... they're letting him work out on their official football field -- and he looks damn good.

Check out this footage of AB running routes and catching passes during a Thursday afternoon workout ... he's clearly the best unemployed WR on the planet.

When we started digging around about the location of the workout, we learned the venue is the official football field of the Hollywood Police Athletic League.

We called the HPAL and a staffer told us AB has been working out there for years -- since his Pittsburgh Steelers days -- and he's got a great reputation with the cops.

In other words, they're happy to host Brown while he tries to get back in the NFL.

What's weird is that Brown is alleged to have raped a woman in Hollywood, Florida in 2018 -- and while the accuser never filed a criminal complaint against him, her civil lawsuit is currently active.

For the record, Brown has adamantly denied the allegations against him.

Kevin Hart is getting back to his famous "Hustle Hart" mode after his horrific car accident -- but he's not rushing into anything intense -- like full action scenes -- just yet.

Sources connected to Kevin tell TMZ ... he's reported to work this week to promote the upcoming 'Jumanji' sequel in a new marketing campaign, which clearly required his presence, because he's nowhere near 100 percent yet.

Ever the trooper though, we're told Kevin is committed to fulfilling his commitments as best as he can. For example, our sources say Kevin did 2 hours of shoots on set Monday, another 2 hours Tuesday, and will be back for another couple on Thursday.

We're told Kevin has not been in full costume for these shoots and he's not walking much for them either -- sitting through most of the day -- even though he can walk on his own these days.

Everyone else on set -- including The Rock, Jack Black, Nick Jonas and others -- have been doing full days themselves. Of course, they're not recovering from a near-fatal wreck.

City Girls member JT is one step closer to freedom ... we've learned the rapper is out of prison, and finishing out her sentence in a halfway house.

Law enforcement sources tell TMZ ... JT was just transferred from FCI Tallahassee to a halfway house in the Atlanta area as she awaits her March 7 release.

It's a huge change of scenery for JT after more than a year behind bars ... inmates in halfway houses get tons of extra benefits, like being able to leave the house during the day to work, and visit family and friends.

Safaree and Erica Mena tied the knot in a blowout ceremony at a castle ... and we've got the first look at her wedding dress!!!

The 'Love and Hip Hop' stars got married Monday at the Legacy Castle in New Jersey ... and Erica was wearing a flowing white dress, which matched Safaree's white tuxedo.

Our sources say Safaree started crying as Erica walked down the aisle with her son ... and 'L&HH' cameras were on hand to capture the couple's very emotional day.

The wedding was super tight-knit and personal -- just family and close friends -- and there were a handful of celebs in attendance ... including Remy Ma, Joe Budden, Papoose and 'L&HH' castmates Sierra and Karlie Redd.

After the ceremony, Safaree and Erica changed into different outfits for a wild reception inside the castle ... and we're told the party lasted way past midnight!!!

Oh and check out the matching wedding bands ... they're covered with over 48 carats of invisible set baguette diamonds surrounded by solitaire brilliant round diamonds. The rings were designed by Eden Diamonds in New York, and we're told they took 2 months to complete and are valued at $128,500.

Antonio Brown is fighting like hell to make sure video of his condo-trashing deposition doesn't see the light of day ... the NFL star just filed docs in court to try to keep the footage under wraps.

As we previously reported ... Brown is accused of being a "belligerent" monster when he sat down for his depo as part of a lawsuit with his old luxury condo complex.

The attorneys for the place -- The Mansions at Acqualina in Miami, Florida -- say AB was not only late for the meeting, but he was also "pugnacious," "defiant" and "profane."

The attorneys also say Brown "chanted, over and over" during the depo ... and they claim all of his actions were recorded on video.

But, in court docs just filed last week, Brown is asking the court to make sure footage from the depo is never made available to the public ... filing a motion to make it all confidential.

In the docs, Brown says if the video is seen ... it'll destroy his ability to get fair treatment in the lawsuit.

As for his actions during the depo ... Brown -- in separate court docs -- said the attorneys' descriptions of his actions were unnecessary, calling them "scandalous, redundant and immaterial."

Brown adds the attorneys only released a description of his depo to "turn this into a media circus" for their "personal gain."

Brown wants the court to NOT impose sanctions against him ... but he adds he IS willing to retake his deposition.

Cassandra Waldon, the very first "Big Brother" contestant to enter the house on the U.S. version, has died.

Cassandra passed away on September 25 ... apparently from injuries related to a car accident in Rome. A source at the United Nations -- where Cassandra worked -- tells TMZ ... she was struck by a car about 2 months ago, and suffered a head injury. We're told she never regained consciousness before her death.

Julie Chen, the host of "Big Brother," remembered Cassandra as a standout houseguest from the debut season in July 2000. Julie posted on Instagram, "Thank you for bringing your intelligence, warmth and wisdom to the Big Brother house Season 1."

She is the answer to the trivia question -- who was first to walk into the 'BB' house? That's kind of a double-edged sword ... as some fan blogs also point out she was first to fall victim to the so-called "First to Enter Curse."

No one who's entered first -- on the U.S. or Canadian (non-'Celebrity') versions -- has ever won the competition. Cassandra finished 6th out of 10 houseguests.

Cassandra worked at the UN as its Director of Communications for the International Fund for Agricultural Development. She was living and working in Rome when the accident happened.

We're told her funeral will be held next weekend in her home state of Maryland. Cassandra was 56.

Stacey Dash will NOT be prosecuted in her domestic violence case ... cause TMZ's learned her case has been dropped.

Prosecutors tell TMZ they dropped the case because the injury -- a single scratch -- was minor and there's no way of knowing if Stacey caused it. Prosecutors also say if Stacey had any physical contact with her husband it was "incidental" on her part.

TMZ broke the story ... Stacy was busted last weekend in Florida for domestic violence after getting into a squabble with her new husband, Jeffrey Marty. We obtained the 911 call in which you hear Stacey tell the operator she's being assaulted by her husband.

Mama June's home where all sorts of bad and crazy things happened is on the market, and you won't believe how it's been rehabbed.

As we reported, the Hampton, GA home is where June's BF, Geno, got in his car wasted, drove in the gated community and ended up crashing into their driveway. He was so intoxicated he had to be carried into the house.

It's also where June and Geno had a massive garage sale. The pics showed the house in shambles.

Well, check out the digs now. It was almost like 'Extreme Home Makeover,' where contractors came in for 3 days and made the house look brand spanking new.

Evander Holyfield is just a few weeks shy of his 57th birthday ... but he's still ready to throw down -- and will fly to Japan for a charity exhibition in 2020.

Holyfield hasn't fought professionally since May 2011 (he beat Brian Nielsen) -- but "The Real Deal" says he's kept himself in prime shape ever since and he's ready to get back in the ring.

The details about the exhibition fight are unclear but Holyfield says he still thinks he's got the at signature knockout power.

Don't get it twisted, Holyfield says the goal is to raise money for people in need -- and not to annihilate his opponent -- so the bout will be more of a performance than a no-holds-barred fight.

"The big thing is to give people in Japan the opportunity to see the only 4-time heavyweight champion of the world."

In related Holyfield news, Evander's 21-year-old son Evan "Yung Holy" Holyfield is about to make his pro boxing debut on the undercard of the Canelo Alvarez vs. Sergey Kovalev fight.

Evan is taking on Nick Winstead in a 4-round junior middleweight matchup.

"Yung Holy" previously told TMZ Sports he thinks he can be better than his Hall of Fame father.

"My dad always tells me every generation gets better. It's pretty much easy to believe, number one it's in the bible, and the bible don't tell no lies."

Justin Bieber took a bling cue from the Kardashian clan -- opting to use their private jeweler to gift himself a super-rare watch that's worth a pretty penny.

Sources tell us that the gold watch JB debuted on Instagram Monday -- which he called "a lil wedding gift" for himself -- is actually quite exceptional, in that it's from a rare, vintage luxury line of watches ... with this one retailing somewhere in the 6-figure range.

The watch is an Audemars Piguet Royal Oak 5402BA, a line that dates back to the 1970s ... and that isn't really made all that much anymore. Current models of AP Royal Oaks have an average price tag of around $50k ... but we're told JB's was worth at least double that.

Now, it's unclear if Justin ended up paying that amount himself -- but if he wanted to auction off the timepiece ... he could probably get in the ballpark of $100k, and possibly more.

Stacey Dash says her husband and his 3 kids conspired to have her arrested ... to cover up her husband's alleged brutality.

TMZ broke the story ... Stacey called 911 Sunday, claiming her husband put her in a chokehold. When cops came out, they observed scratches on husband Jeffrey Marty's arms -- this, along with statements from his kids, got her cuffed and booked for assault.

Stacey says in the 911 call Jeffrey coached his 15, 14 and 10-year-old on what to say to cops. At one point, Stacey accuses Marty of faking his injuries, claiming he was taking photos of scratches on his arms ... scratches she didn't inflict.

Ray Lewis is OUT of "Dancing with the Stars" -- the NFL Hall of Famer suffered an injury while practicing a Cha-Cha .. and his castmates are already sending their love.

The 44-year-old Baltimore Ravens legend and his partner Cheryl Burke were rehearsing for their tribute to "Ferris Bueller's Day Off" when Ray tore a tendon in his foot ... just like he did during his playing days.

Of course, the whole thing played out during the broadcast of the show Monday night -- when Lewis revealed he tore 3 tendons in his foot and would need surgery.

"In a game in 2010, I tore a tendon in my foot," Lewis said on the show ... "And, now, all of this dancing, all of this on your toes, I’m reliving a problem that I thought I’d never have to live again."

"I am having so much fun when it comes to the dancing part. But, the part behind the scenes, it’s just been painful. It’s bothered me a lot."

"When [the doctor] read that MRI to me today, I knew something was wrong."