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The Rock and his new 'Jumanji' costar, Danny DeVito, did their best Vince Vaughn and Owen Wilson south of the border -- but, truthfully, it's hard to say if it's an ad or for real.

Case in point ... Dwayne Johnson's video from Sunday -- he and Danny elaborately ducked in on someone's wedding down in Cabo San Lucas and crooned to the crowd. It's sooo well-produced ... like a short film or something ... it feels like it was staged.

However, the pics of their wedding crashing cameo seem pretty candid ... so maybe it wasn't a stunt, and did in fact happen spontaneously.

Check it out ... DD and DJ were celebrating their recently completed week full of interviews promoting 'Jumanji.' It appears they heard the wedding party going down nearby, and decided to crash. Yep, just like it was written in a movie script.

Then comes what looks to be the real-life moment when they pop into the ceremony through the back kitchen with a mic in hand, and they belt out Nat King Cole's "Unforgettable." The wedding guests couldn't get enough and ate it up.

The 2 actors had some kind words for the happy couple afterward and took some pics with the whole wedding party.

Kim Kardashian West is confident her SKIMS Solutionwear brand will revolutionize its industry ... and customer response has indicated it's on pace to become Kim's billion-dollar brand.

Sources with direct knowledge tell us Kim's massive restock release on Wednesday was actually more successful than the initial launch ... netting millions in just minutes. We're told that over a million people were on the wait list for the restock, and that almost instantly ... the most popular sizes and styles sold out.

Like we said, nearly the entire new batch of SKIMS left the digital shelves like hot cakes, and Kim issued an apology to those who were once again left empty-handed.

We're being told part of the reason it takes a while to get more SKIMS products out to the world is because Kim and co. produce their own fabric that is exclusive to the line -- which is why SKIMS-wear is so unique and somewhat difficult to churn out at the rate people want it.

Kim's cosmetic and perfume collections have also generated a massive response this year, and  SKIMS has been so successful, there's been a push for a male line.

Our sources say there's plenty more to come from SKIMS -- Kim also released body tape -- and they'll continue to introduce new products.

If SKIMS does hit the billion-dollar mark, she'll join some very familiar company. Kanye's Yeezy brand with ADIDAS is valued at over a billion ... and Kylie was named the youngest self-made billionaire by Forbes earlier this year. Kylie also just sold 51% of her cosmetics brand for $600 million.

Elon Musk takes risks -- and his latest cost him dearly.

Tesla's share price plunged by 6% since the close of the market Friday ... and that takes $768 million out of Musk's pocket.

There's little doubt ... the reversal of fortune is tied to Thursday night's unveiling of the Cybertruck at SpaceX headquarters in Hawthorne, CA.  As we reported, Elon -- who billed his latest creation as indestructible -- wowed the crowd at first by taking a sledgehammer to the truck's door with no ensuing damage. But, then ... the chief designer took a metal ball and tossed it at one of the truck's windows and it shattered. He tried again with even less force with the same result.

It's unclear if the failed demonstration is the only reason for the stock plunge. The design of the truck has met with mixed reviews. As you can see and hear ... Eva Longoria's not a fan.

As for Elon ... fear not. Even with the hit his estimated worth is $23.6 billion. What's interesting ... there are 40 people in the world richer than that.

Elon Musk has a smashing success on his hands, and we mean that in the worst way possible because his new Tesla Cybertruck -- billed as shatterproof -- shattered moments after he unveiled it.

We'll say this ... if Elon isn't firing a handful of people right now, he's going soft. On Thursday at SpaceX HQ in Hawthorne, CA ... he pulled back the curtain on the Cybertruck, and had a staffer throw a metal ball at the driver side windows to prove the near-indestructibility of its "armor glass."

It couldn't have gone worse as both windows shattered. Elon seemed to vamp to find a silver lining, saying ... "It didn't go through. That's a plus side."

It was reminiscent of some of SpaceX's early Falcon 9 rocket disasters. 'Memba this one? Juuuuust a bit outside of the landing pad, and into the drink!

To be fair, the Falcon 9 works like a charm now, so maybe that bodes well for the Cybertruck's future, but calling its introduction an embarrassment is an enormous understatement.

In fact, it went sooooo badly, it smells of a setup. The question -- was Elon in on it, just to make sure the new Cybertruck unveiling went viral? OR, was Elon set up by prankster employees?

If it's the latter, like we said ... someone's looking into unemployment benefits right now.

Courteney Cox is filled with gratitude and can't stop thanking the photographer who ran out onto treacherous Pacific Coast Highway and saved her 2 pooches.

Courteney was leaving Giorgio Baldi restaurant Thursday night in Santa Monica and ran into the photog who scooped up her 2 Cavalier King Charles Spaniels after they bolted from her Malibu mansion onto the PCH.

Mind you ... Courteney profusely thanked the photog Wednesday after he handed off the dogs to her, but the appreciation was in full bloom at Giorgio Baldi. Matter of fact -- watch the video closely -- she definitely hands him something that seems to be a cash reward.

The photog is really gracious ... making it clear he didn't want anything in return for saving her dogs -- not even a photo.

Jason Derulo let the cat out of the bag about what he's packing down below, and he's making it clear there was no Photoshop involved ... he's just blessed.

We got the singer and "Cats" star leaving Hyde Lounge in L.A. in the early morning hours Friday, and asked him about his recent Instagram shot flaunting his chiseled physique and his, um ... well, take a look.

Jason tells us when he posted the pic -- which he says was taken months ago in Bali -- he didn't expect it to become his most popular. Unclear if he expected it to get flooded with lustful comments and eggplant emojis, but ya gotta think so ... especially when he replied to a fan asking “What animal are you hiding in your pants?” by answering, “Anaconda.”

Anyway, according to Rum Tum Tugger, the photo in his nut huggers is 100 percent real and natural ... and he has his Haitian heritage to thank for his impressive endowment.

His parents should be proud.

Brad Rutter says he came out on top in previous battles with fellow "Jeopardy!" champ Ken Jennings thanks to a little luck, but Ken got the biggest break of all ... from the TV gods.

Rutter -- the highest money winner of all time on the game show -- joined "TMZ Live" Thursday to talk about his storied rivalry with Jennings ... which is set to be renewed on the upcoming 'Greatest of All Time' tournament.

Brad reminds us his past matchups with Ken were very close and could have gone either way, but points out that you make your own luck too. So, yeah ... fair to say he's suggesting he's a LITTLE better, and that's why he's slightly favored over Jennings.

Despite their history, and the fact Rutter's never lost a match (to a human, anyway), Jennings is the more famous of the 2 "Jeopardy!" champs.

Why? Brad has a pretty solid explanation -- face time equals fame ... and Ken was lucky to get more of it.

It's all in good fun, of course ... Brad tells us he and Ken are friends outside the show, and a very notable butt-kicking they both received brought them closer together. Like we said, Brad's undefeated ... if you don't count robots.

Rutter also says Alex Trebek is doing an astounding job hosting the game show despite dealing with pancreatic cancer ... and marvels how he seems to be getting better.

"Jeopardy! The Greatest of All Time" will air in January, and it should be noted -- recent phenom James Holzhauer will be the third champion looking to take the title from Brad and Ken.

If Bernie Sanders wins the Democratic nomination for President ... he might have this endorsement from one of the biggest pop stars in the world to thank.

Ariana Grande just shared a couple photos with the 78-year-old Vermont Senator, thanking him for hitting up her concert in Atlanta Tuesday night and "making my whole night and for all that you stand for !"

She went on to say she's doing her best to register young voters and has already gotten more than 20k sign-ups at her shows. She added ... "i will never smile this hard again promise."

From the looks of it ... Bernie might not either!!!

Sanders is in town for tonight's fifth primary debate, which will feature 10 contenders for the Democratic nomination. Not that he needs the energy boost ... but ya gotta think a plug from Grande will provide one anyway.

BTW -- this isn't the first time Ariana and Bernie have had a noteworthy connection ... last month she posted "baby how u feelin" on Twitter, and he replied by tweeting he's ready to fight for Medicare for All.

She replied, "screaming" ... as many of her fans and Bernie fans are now, as well.

A Lyft driver pulled a female passenger out of his car, and allegedly started to attack her -- kicking off a chain reaction of fights with concerned passersby.

TMZ got a hold of this WILD surveillance video recorded Tuesday afternoon in L.A., and it starts with the car -- which has the Lyft emblem in the back window -- parked curbside along busy Melrose Avenue. Then the male driver hops out, and pulls a young woman from the seat behind him and starts dragging her out of the vehicle while tossing her stuff out at the same time.

The woman, actress Alessandra Starr Ward, tells TMZ the whole thing started when she started playing a song called "Te Bote" from her phone. The driver demanded she turn it off, she refused, and they started arguing. He allegedly threatened to boot her from the car, and she told him she'd call police if he did.

In the clip, you can see Alessandra fighting back, but the driver pushed her down and knocked her over. Drivers in other cars saw it unfolding and a few guys stopped to help.

That's when it really hit the fan ... several guys teamed up on the Lyft driver, who continued fighting back, and in the scuffle ... Alessandra got knocked down again. It took one guy putting the Lyft driver in a chokehold to finally calm things down.

We're told nearby police officers were flagged down, and cited the Lyft driver for misdemeanor battery. As for Alessandra, she says she went to the hospital and was diagnosed with a concussion. She also says she has bruises all over her body, a sprained ankle and a black eye.

She tells us Lyft needs to vet its drivers, as this shouldn't happen to anyone. It's unclear if she plans to pursue legal action against the rideshare company.

Dog the Bounty Hunter wants it known -- he's NOT dead like the Internet might have you believe ... and we got our hands on a good old-fashioned "proof of life" photo to back it up.

The reality TV star took this hilarious photo of himself Tuesday holding a handmade "I'm Alive!" sign in one hand and that day's Denver Post to prove he is, in fact, still with us. We're told this was in response to a fake death story that was going around on Facebook.

Tons of fans were flooding Dog's social media with condolences and "RIP" posts, and our sources say Dog's team even reached out to him to make sure he was all good.

We're told Dog was on his way to a workout when his phone started blowing up and he first heard about the hoax -- which claimed he'd died because his grief over his late wife, Beth Chapman, caused a flare-up of his recent heart problems.

The top 3 "Jeopardy!" contestants to ever win big are going head-to-head (to head) on TV -- and one guy who had a great run thinks he knows what sorta questions will be asked.

We spoke to Austin Rogers -- who had a 12-game winning streak in 2017 -- and he mused with us over what Alex Trebek and his crafty writers are gonna ask Ken Jennings, Brad Rutter and James Holzhauer come Jan. 7 for "Jeopardy! The Greatest of All Time."

It's exactly what it sounds like -- these guys have amassed the most cash out of anyone on the show, and it's time find out who's the true king in a 3-way face-off. As for what'll be asked -- or answered, rather -- Austin tells us the "Jeopardy!" crew will get diabolical.

Fact is, Austin says the writers know exactly how to tailor the topics for these three -- and he believes they'll be throwing pop culture curveballs instead of ancient history softballs.

Check it out -- Austin even weighs in on who he thinks has an edge here among these titans of trivia, and it sounds like our boy, James, is in the driver's seat with his scattered approach in hunting for Daily Doubles ... and his go big or go home wagers.

Good luck, fellas!!!

Rep. Eric Swalwell seemed to cut the cheese live on national TV ... but the cheese, as it turns out, was apparently a studio mug.

The California congressman was doing an interview Monday on MSNBC's 'Hardball' with host Chris Matthews -- and while he was going on and on about Ukraine and alleged malfeasance by DT ... something that sounded like a loud, wet fart blasted through the airwaves.

It certainly seemed like flatulence, and Rep. Swalwell even paused a moment right afterward in what many viewed as an acknowledgment of the ripped gas. And, of course, #fartgate and #shartgate soon started to trend everywhere on Twitter as a result.

Funny enough, the official 'Hardball' account excused the noise away as someone dragging a coffee mug across a table in the studio -- which just happened to get picked up on a mic.

Swalwell was ecstatic, quickly using the network's cover as what he described as "TOTAL EXONERATION!" -- very Trump-like, right?! And yes, everyone had a good laugh over it -- Republicans and Dems alike. It might've been the most uniting thing in a while, actually.

And, for those looking to go even deeper down the rabbit hole ... some have pointed to a theory that the would-be fart actually came from Matthews. Apparently, there's a history of gas being passed on his show over the years, as one Twitter user dutifully pointed out.

Anyway, if these impeachment hearings are lacking pizzazz -- as NBC News itself noted last week -- then Swalwell (or Matthews) just dropped a much-needed fun fart bomb.

Touching moment on the golf course this weekend ... a fan with Down Syndrome yelled during a critical putt, but the PGA Tour Latin America golfer who missed the shot quickly forgave the guy with a hug and autographs.

The incredible scene all went down on Sunday at the Visa Open de Argentina in Buenos Aires ... where Brandon Matthews needed to sink an 8-footer in a playoff hole to keep his championship hopes alive.

But, while the 25-year-old was in the middle of his backswing ... a fan yelled out, causing Brandon to shank the putt -- and you can see on video, Matthews was initially pissed.

"I kind of flinched on the putt and immediately knew I missed it," Matthews told Golfchannel.com. "I thought someone had done it intentionally. I was frustrated."

But, when tournament officials went to Matthews and explained to him the fan had Down Syndrome and didn't mean any harm ... they say Brandon nearly cried.

Matthews raced over to the fan ... embraced him and handed him a signed glove and golf ball.

"I gave him a hug and I asked him, 'Hey, are you doing okay? Are you having fun?'" Matthews said. "I just wanted to make sure he was enjoying himself, that he had no hard feelings, that he didn’t feel bad about what happened."

It's an awesome gesture from Matthews, considering if the guy had won the tournament, he would've received an automatic invite to the prestigious British Open in 2020.

A giraffe at the Cincinnati Zoo has died after what appears to be a bad reaction to a recent surgery done on its hooves ... which was supposed to mitigate a major health issue.

The zoo says that the male giraffe, named Kimba, passed away Sunday after it had collapsed to the ground early that morning in the zoo's giraffe barn -- where the staff had been monitoring a pregnant female giraffe who's supposed to go into labor any day now.

It's unclear how exactly the giraffe ended up dying -- the Cincinnati Zoo says they're awaiting the results of a necropsy to learn more about what exactly happened -- but they note that Kimba had been dealing with complications from a surgery he had done on his hooves last week. The photo above shows Kimba getting that work done by a team of specialists.

The surgery was meant to help Kimba fight off chronic lameness in his legs -- something the zoo says he'd been experiencing since last summer ... which was causing mobility issues.

The surgery was basically a hoof trim, and based on what the doc told them ... it was supposed to make him "sound" again -- but unfortunately, it sounds like it didn't take. Kimba was 12 years old, and had sired 6 calves, including a 7th on the way now.

Of course, this is the same place where Harambe the gorilla was shot and killed a few years ago after a child fell into his cage and got dragged around by the animal.

Sad news all around.

The rescue puppy with the tail growing out of his head will have to wait to find a forever home, because the shelter's worried some folks applying to adopt him might have the wrong motives.

As we reported ... the undeniably cute little dog named Narwhal is "a perfectly healthy puppy, with an extra tail on his face" who was rescued by Mac's Mission Animal Rescue in Jackson, Missouri. Naturally, he's gone viral due to his unique condition.

The shelter has received hundreds of adoption applications for Narwhal, but its founder, Rochelle Steffen, tells TMZ ... she's pumping the brakes for now. She says on Wednesday alone they got more than 100 applications, which is highly unusual because they are normally lucky to get one for a "special dog."

She tells us the shelter is nervous people may be wanting to adopt Narwhal for the wrong reasons -- for instance, fame and notoriety -- and not for love of a family pet. As a result, Rochelle says they're halting the application process for at least 2 months.

Rochelle says they've never had a dog like Narwhal, so they want to keep him and let him get bigger while they monitor the tail and make sure there are no negative health effects. If all's well in 2 months, they will put him back up for adoption, but she says they'll likely add a few questions to narrow down prospective candidates.

Rochelle adds, Narwhal's been checked by a vet and she's been told there is no reason to remove the tail -- it doesn't wag and has no bone structure -- so it would be a cosmetic surgery.

Chris Morgan, aka The Angry Bagel Guy, is currently in a New York hospital after suffering an apparent stroke ... TMZ has learned.

Morgan's manager, Bill Shannon, tells us Chris was outside a Long Island deli Monday when the medical emergency happened. Shannon says he's with Chris in the hospital now, and it appears he's lost feeling on the left side of his body. A video posted on his Twitter account showed Chris laid up in his hospital bed.

There does seem to be at least one positive sign -- Bill tells us Chris was able to raise his right arm to respond when Bill entered his hospital room. Bill says Chris has diabetes, but it's unclear if that's related to the apparent stroke.

We're told Chris' family members are on their way to the hospital.

Morgan gained internet fame back in July when he was caught on video in an angry confrontation inside a NYC bakery.