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Mario Lopez got assaulted by a fellow spa goer who smashed his phone and got so aggressive cops had to be called.

Sources tell us Mario was working out at the Planet Hollywood Spa by Mandara in Vegas Friday and as he was leaving the bathroom in the spa, he bumped into a guy ... and things escalated quickly.

We're told Mario said "excuse me" to the man, who replied "you got a problem?" The dude was about to step to Mario and make physical contact before an employee got between them.

Mario had left his phone on one of the locker room benches before all of this, and said he just wanted to get his phone and leave. That's when we're told the guy suddenly grabbed Mario's phone and threw it against a wall ... smashing it to pieces.

Security arrived and cops were eventually called. Law enforcement sources tell us they responded to the Planet Hollywood Spa, but no arrests were made as Mario refused to press charges. He did, however, get his phone replaced by the hotel free of charge. Later that night, Mario caught Jennifer Lopez's show with his wife ... so it seems like he's alright.

We're told the man that almost fought with Mario is a known troublemaker ... and is now banned from the facility. We've reached out to Mario's camp ... so far, no word back.

A location scout for Netflix's hit show "Narcos" was shot and killed this week while working in Mexico ... this as the upcoming season shifts its focus to Mexican drug cartels.

Carlos Muñoz Portal was found shot to death Monday in central Mexico during location scouting for season 4 of "Narcos." He was reportedly found riddled with bullets in his car in a remote area near Hidalgo, which is known to have one of the highest murder rates in Mexico.

Netflix issued a statement saying ... "We are aware of the passing of Carlos Muñoz Portal, a well-respected location scout, and send our condolences to his family." Police are currently investigating the circumstances of Portal's death.

The new season of Narcos is expected to focus on the origins of the Juarez cartel in Mexico, and filming was supposed to go down there as opposed to Colombia where past seasons were shot.

Unclear if Portal's death will derail production.

U2 is pulling the plug on its concert tonight in St. Louis because police have their hands full dealing with ongoing protests of a not guilty verdict in a police involved shooting trial.

Live Nation and U2 say the St. Louis Police Department has informed them they're not in "position to provide the standard protection for the audience" that would normally be expected. The band goes on to say they didn't want to risk fans' safety by proceeding with the concert.

The protests come following the acquittal of a former police officer who was charged with first degree murder of a black motorist following a high speed chase in 2011. Some demonstrators burned a U.S. flag and surrounded the mayor's home.

The police chief says 10 officers were injured in the violence, and they've arrested 32 people.

TMZ has obtained police video of the arrest of Jean-Claude Van Damme's son, and it's pretty intense.

TMZ broke the story, 21-year-old Nicholas Van Varenberg was arrested last Sunday in Tempe, Arizona, after a disturbance. Cops found a trail of blood leading to Nicholas's apartment, and apparently the roommate answered the door and let them in. Cops asked a few questions, then left.

But law enforcement sources tell us ... the roommate ran downstairs, claiming he had just escaped after Nicholas had been holding him at knifepoint ... furious he had opened the door.

The video starts when the cops returned to the apartment and are interviewing the roommate. It then cuts to the cops going down the hallway to arrest Nicholas. You heard him insist he had not gotten into a fight with anyone, but cops weren't buying it.

Police tell TMZ they searched the apartment and found a knife and weed. Nicholas was booked for aggravated assault with a deadly weapon, unlawful imprisonment, marijuana possession and possession of drug paraphernalia.

Colin Kaepernick's plight in the NFL has seeped into the upper echelons of hip-hop ... 'cause Jay-Z dedicated 1 of his most racially charged songs to the QB during a live show.

Jay was performing his new hit, "The Story of O.J.," Friday night in NYC, when he gave a shout out to Kaep and said the performance was for him ... and the late activist Dick Gregory, who died last month.

He also said ... "I want to dedicate this song to anyone that was held back and you overcame whatever it was."

Blac Chyna may be settling her custody war with Rob Kardashian ... but she's not done with him in court.

Sources close to BC tell TMZ ... Chyna did NOT settle her beef with Rob over his revenge porn meltdown .... when he plastered nude pics of her all over social media.

Chyna is determined to get her pound of flesh from Rob, in the form of 7 figures. She's still fuming over losing a couple of weight-loss endorsements, she says because the pics made it apparent she's had plastic surgery and the companies want au naturel.

Our Chyna sources say she has a meeting with Rob's team -- presumably with her lawyer Lisa Bloom -- and a big fat check needs to be passed across the table or she'll see him in court.

TMZ broke the story, Chyna will get $20k a month from Rob in child support.

Stay tuned.

Martin Shkreli has one thing going for him in prison ... a tasty menu!!!

The Pharma Bro -- who got his ass thrown back in jail after a judge revoked his $5 million bail for threatening Hillary Clinton -- is getting the goods at Metropolitan Detention Center in Brooklyn. Or as good as it can probably get for his taste buds.

Martin -- who's been convicted in a securities fraud case -- will have healthy options to choose from come chow down time. Among the tasty and hearty choices:

-- Soy hot dogs

-- Soy burgers

-- Turkey burgers

-- Vegetable soup

-- Chicken wrap or hummus wrap

-- Chicken fajitas

-- Cream of broccoli soup

-- Peanut butter & jelly sandwiches

-- Roast beef

-- Beef tacos

-- Sloppy Joes

-- Swedish meatballs

-- Baked ziti

Serena Williams's baby is just weeks old, but she's already making a name for herself.

Serena posted this pic of Alexis with a onesie that is more like a mantra for what is going to be her life.

Alexis is wasting no time becoming famous. Check out her new Instagram page, with more than 21,000 followers.

The baby's dad, Alexis Ohanian, is pictured with his daughter ... or at least his arm is.

We've been on the hunt trying to figure out if a famous kid of one sex has ever been named after his or her parent of the other sex, but so far we've come up dry.

The Hurricane telethon was awesome, but some people think it got too political. And Selena's kidney transplant raises the question ... What would you do? So we gotta ask ...

ESPN host Michelle Beadle scoffed at the idea anyone owes Donald Trump an apology ... especially Jemele Hill.

Michelle was on her way to work in L.A., where she co-hosts SportsNation on ESPN, and she sure seems squarely on the side of Jemele, who called Trump a white supremacist on her twitter account.

Trump is demanding an apology for "untruth" but Michelle is clearly unmoved.

Brooklyn Beckham took a break on the sidewalk, looking a little spent, as he seemed to be waiting for someone outside the fashion school he's attending.

Brooklyn's a student at the famed Parsons School of Design in NYC where he's studying photography, but his plate is fuller than that. He just released his first book, "What I See" ... a photography book -- mostly pics from his phone with captions.

The photog says Brooklyn was waiting for Mom Victoria, who picked him up and took him to lunch.

When Floyd Mayweather says Donald Trump's "locker-room talk" is A-OK, no one should listen ... CAUSE HE'S ILLITERATE -- this according to "Shameless" star Cameron Monaghan.

We got Cam leaving Catch ... and the actor came at Floyd for claiming Trump's "grab them by the p***y" comment was how "real men speak."

"He's a great boxer, but he can't read! Don't listen to that guy, it's ridiculous."

Cam says real men have respect ... and would never talk like that.

FYI, Floyd's got video proof that he CAN read -- but the kid's got a point.

Simon Cowell's a boy band magician ... the question, does he have lightning in a bottle yet again?

PRETTYMUCH dropped the official music video for its debut single, "Would You Mind" ... it's undeniably catchy. The release comes just a couple months after the 7-year anniversary of a Simon concoction called One Direction.

You'll remember ... we spotted the members of PRETTYMUCH -- Austin, Brandon, Edwin, Nick Mara, Zion -- leaving Cowell's house back in May when we were told something was in the works.

Listen and judge for yourself.

Don't let these almost identical photos of Heidi Klum push you away ... Dig deep into your skull and see if you can spot the differences between these spooktacularly similar shots.

The teen who plays Damon Wayans' daughter on the TV remake of "Lethal Weapon" banked nearly $150k for her first season, but still couldn't get a toilet guaranteed from the show.

Chandler Kinney plays Riana Murtaugh on the FOX series. She signed a 7-season deal, which earned her $15k per episode in season 1. Good money, for sure, but here's the reality of being a 17-year-old up-and-comer in Hollywood.

Chandler's reps couldn't get production to promise she'd have a private bathroom in her dressing room. Doesn't seem like she made much of a stink about it -- Chandler went on to appear in 10 outta 18 episodes.