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Ronda Rousey has already mastered the "Battle of the Network Stars" obstacle course -- but her friends ... well, they BOTH ended up in the water pit during a test run on the L.A. set.

TMZ Sports has footage of the UFC legend coaching her mom and sister as they tried to navigate everything from the rope swing to the monkey bars.

Ronda easily conquered the obstacles at Pepperdine University -- her fam had a much tougher go. Fortunately, Ronda was there to pull 'em BOTH out of the water.

Ronda is a permanent "team captain" on the show -- and every week, she'll lead a squad against DeMarcus Ware's team.

No word on how the contestants will be. Hopefully, they're practicing their rope swings.

Gucci Mane and his fiancee, Keyshia Ka'oir, are about to get what every soon-to-be married couple wants -- a whole lotta cash for their wedding.

The rapper and his longtime girl landed a $650k contract with BET for a reality show leading up to their nuptials -- $400k for him and $250k for her ... according to sources close to the deal. We're told the network will also cover the cost of their wedding ... which will be around $1 million!

The TV series will document the lives of Gucci and Keyshia leading up to the nuptials October 17. It's slated for 8 episodes and will feature bachelor and bachelorette parties. Filming begins in a few weeks.

Our sources say VH1 was the front-runner to nab the show, but BET swooped in with a much better offer. We're told the plan is for the wedding to go down in Miami ... with around 200 guests.

You may recall ... Mane proposed to Ka'oir on the kiss cam at an Atlanta Hawks game, so it's clear they don't mind the public attention.

Demi Moore has fired back at the family of the man who drowned in her swimming pool, claiming his own negligence caused his death.

The family of Edenilson Valle claims he was left alone in her backyard after Demi's caretaker threw a small party and everyone but Edenilson left. They say a rock was dangerously placed near the pool and Edenilson -- who could not swim -- tripped, fell in and drowned.

Demi says in her response it was Edenilson's fault ... presumably because he didn't see the rock in plain sight.

That water slide viral video is the real deal according to the guy who pulled it off ... and he told us exactly how he perfected the gravity-defying move.

The guy's name is Rolando Johnson ... a 21-year-old lifeguard at Pirates Island Waterpark in Jamaica. He says he practiced it for 2 years before finally sticking the landing, but the technique is pretty simple:
1. Get a big push at the top of the slide for maximum speed
2. Cross your legs and sit up RIGHT before shooting out of the tube.

Rolando says that sitting up motion, coupled with the speed creates the glide.

He added, there's no tricky business with his shirt -- he always pulls it up to his chin to hold it there.

Rolando's no unicorn though ... he says a bunch of his co-workers can do the glide, he just happened to be the one captured doing it this week.

He says the lifeguards are now a tourist attraction ... with people lining up to watch 'em skip their ass over the pool.

LeBron James wasn't wrong in invoking Emmett Till's name when discussing racist vandalism at his home, so says Till's cousin who told TMZ Sports she doesn't get the criticism of the King.

James used Till's name during a news conference where he addressed the incident, comparing his public discussion of the crime to Till's mother using an open casket to show the world her son's battered body.

The comparison immediately drew the ire of those who said LeBron had no right likening his situation to one of the most horrific incidences of racial violence ever.

We spoke to Deborah Watts, Till's cousin and co-founder of the Emmett Till Legacy Foundation, and she told us she has no issue with LeBron's choice of words.

"I don't understand the criticism. What he did in using his platform was very, very powerful, and I really appreciate his courage."

Watts went on to clarify very strongly that while LeBron's incident was nowhere near the level of Till's, it warranted a strong public response ... especially now.

"Is it lynching the way Emmett was murdered and killed? No. Was it a part of an environment that created an opportune time for people to feel like they could do it? Yes."

A California family is suing Amazon for allegedly selling them a hoverboard with a cheap battery that caught fire and burned down their home and incinerated their 2 beloved pooches, Bella and Boo.

The family claims Amazon sold them a hoverboard for Christmas, 2015, with a substandard battery and a manual instructing them to "store the scooter indoors."

A month later they say they left the scooter charging inside their home and came back to find the home engulfed in flames as firefighters tried in vain to revive Bella and Boo on their front lawn.

A day after their home burned down, the family claims a worried neighbor who had purchased the same hoverboard called Amazon's customer service line and was instructed to 86 the scooter.

The family says even worse ... the company issued an alert warning of the danger, but never notified them.

We reached out to Amazon ... a rep says they have no comment.

XXXTentacion tried really hard to top his tour mate, Wifisfuneral, with 2 INSANE crowd surfing moments during a show in Scottsdale.

XXX climbed about 15 or so feet above the crowd, before launching himself on top of his fans. We'll say this ... they're really loyal, because he survived. The rapper also allowed himself to be hurled into the mosh pit Sunday night -- and again, walked away in one piece.

Much better ending for XXX than his homie, Wifi, who got the piss beat out of him last week when he did a front flip into the audience.

We know this -- do NOT look down when you're at this show.

First Bill Maher, now another white comic is dropping the n-bomb -- this time, it's Jay Mohr who used the word twice in a Twitter rant about rapper Boosie Badazz.

Mohr was reacting to an interview Boosie did describing how he witnessed fellow prison inmates engaging in anal sex. Boosie made several homophobic comments during the interview.

Jay tweeted about the interview -- pointing out Boosie's gratuitous use of the n-word.

"LIL Boosie says N**ga 19 times but twitter accusing him of Being homophobic," Jay wrote.

Mohr then weighed in on a separate Twitter conversation -- in which one commenter called another commenter "corny."

Jay wrote, "This n**ga just got called corny."

For the record, Jay has been using the n-word in his stand-up routine for years -- and has never really taken heat for it.

But now, with the backlash against Bill Maher -- and the fact he's dating Lakers owner Jeanie Buss -- is it the best idea to be using the n-word so cavalierly??

Jay's not backing down.

Morgan Spurlock is applauding Reality Winner for "stepping up" to help Americans get closer to the truth ... even though she's been charged with leaking a classified NSA document.

We got the "Super Size Me" filmmaker at LAX, and he was very candid about Winner's arrest. He stopped short of calling it BS, but said he thinks government whistleblowers are a necessity these days ... especially if it relates to Russia.

Andrea Constand repeatedly choked up as she testified Bill Cosby drugged and sexually assaulted her back in 2004.

She told the jury Cosby had given her 3 blue pills to relax ... herbal, so he allegedly said. But Constand testified 30 minutes later she was slurring with blurred vision ... her legs rubbery.

She says she was so out of it she couldn't fight him.

Constand testified for about an hour. During cross examination, Cosby's lawyers tried poking holes in Constand's story, pointing out inconsistencies in her story. The lawyers also confronted Constand, claiming she had 2 previous "sexual situations" with Cosby. She said they were merely suggested sexual situations.

Gloria Allred, who reps other women who claim they were also assaulted, looked on in the peanut gallery.

April the Giraffe just granted a very special wish to a 10-year-old boy who had watched her for months with the rest of the world.

Alex, who has a life-threatening seizure disorder, and his family traveled from Ohio to the Animal Adventure Park in New York Tuesday for the meet and greet. We're told when Alex was offered a wish through the Make-A-Wish Foundation, his decision to meet April was without hesitation.

You'll remember ... millions watched April's live stream through her pregnancy and birth of her baby boy, Tajiri, nearly two months ago.

That amazing water slide video -- where the guy glides across the surface of the pool -- is really fishy. Or at least one key part of it is.

Like the rest of you, we've been watching the clip over and over ... trying to understand how it could be. Admittedly, we suck at physics, but we slowed down the video and noticed the electric glider's shirt appears to be fully on as he scoots across the water. Just as he reaches the pool's edge, a woman walks in front of the camera -- after she passes, the guy is pulling his shirt back over his head.

Hmm ... seems like there could have been an edit.

Still, we also found a slew of other vids from the resort in Ocho Rios, Jamaica and there are NO obvious edits in these clips. Like we said ... physics. Go figure.

Sanya Richards-Ross says she "absolutely" has regrets she was put in a situation where she got an abortion right before competing in the Beijing Olympics -- but she sounds like she still thinks she made the right decision.

We spoke with the U.S. Olympic track star about the bombshell revelation she made in her new book, 'Chasing Grace' ... and she shed more light onto the decision to terminate her pregnancy.

"I felt like it was a choice I had to make in order to continue pursuing my dream," Sanya said.

1:57 PM -- A spokesperson for the university tells TMZ it intends to vigorously defend its actions and it looks forward to "contesting this collection of false claims." The school adds, "We are confident that UCPD's actions will be vindicated against the plaintiff's uninformed allegations."

A Milo Yiannopoulos fan blames UC Berkeley for allowing protesters to attack her when she showed up to hear Milo's speech ... and now she wants the university to pay up.

Kiara Robles, a Berkeley student, says she showed up for the right-wing commentator's speech back in February, but it was canceled when protests erupted on campus. In docs, obtained by TMZ, she says 15 minutes after arriving ... she was attacked with "extremely painful pepper spray" by masked and unmasked assailants.

She claims there was zero police presence where the attack happened, and her attackers were able to escape.

Robles isn't just going after the university either. She's also suing Berkeley's president, chancellor, regents chair ... also the city's mayor, police chief, the California Democratic Party chairman and Congresswoman Nancy Pelosi.

Robles accuses school officials of "willfully withholding police manpower" because they disagree with conservative viewpoints. As for how Pelosi's been dragged into this -- Robles says she's suing her for assault because Pelosi advocates "violence toward President Trump supporters."

Robles wants damages in excess of $23 million.

We've reached out to UC Berkeley and Pelosi's office, so far no word back.