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Katy Perry just hired a bunch of HUGE athletes for her new music video -- everyone from Rob Gronkowski to Karl-Anthony Towns ... even Joey Chestnut!!!

It's all for Katy's new "Swish Swish" video -- which all takes place at a basketball game, with Bill Walton and Rich Eisen announcing.

Some of the highlights ... Katy "Kobe" Perry takes on the guy who plays The Mountain on "Game of Thrones" while Chestnut slams down hot dogs in the crowd.

Gronk holds a sign. Karl-Anthony busts out the "Backpack Kid" dance.

Good times.

Hundreds of people rallied in support of Colin Kaepernick in NYC Wednesday -- including Susan Sarandon -- who said proudly, "I'm With Kaep."

The "United We Stand" rally went down in front of the NFL headquarters in New York -- stars like Kurtis Blow, ex-NFL player Willie Colon and rapper Mysonne were all there.

Sarandon tweeted about the rally -- saying, "Together we win. I stand with Colin."

Members of Kaepernick's college fraternity -- Kappa Alpha Psi (a historically black fraternity) -- were also marching for the QB.

Several people gave speeches applauding Kaep for taking a stand -- and imploring NFL owners to sign him.

Chiefs legend Neil Smith just became even more legendary in Kansas City ... rescuing a woman he says was "about 9 months pregnant" trapped in a K.C.-area flood on Tuesday.

It all went down in Lee Summit, Missouri ... where Smith drove by a woman whose minivan was stalled on a dangerously flooded road.

The 6-time Pro Bowler quickly rushed to her aid -- using his 6'4'', near-300 pound frame to guide her out of the waist-high water.

"I was just in the right place at the right time," Smith told FOX 4 News in K.C. "She was very short, so I had to walk her out of there."

The flooding has reportedly led to at least 160 rescues and 1 death ... and the former superstar lineman may well have prevented another.

Salute!

They stopped. They dropped. They shut 'em down AND opened up shop.

Usain Bolt and Dwyane Wade went all the way back to '98 at a nightclub in Greece Tuesday night -- grabbing the mic and busting out DMX's legendary "Ruff Ryders' Anthem" ... and it was AWESOME!

D-Wade's in Mykonos for an anniversary trip -- no word on why Bolt's there -- but they met up behind the DJ booth in a Mykonos nightclub and partied like they were old friends.

We're sure DMX woulda loved to have been there too ... if he wasn't on house arrest.

UFC heavyweight Mark Hunt is throwing MAJOR shade at Jon Jones -- calling the guy a "cheating ass loser" after failing his UFC 214 drug test.

Hunt has gone through steroid scandals in the past -- his UFC 200 opponent tested positive for a banned substance after they fought. Hunt sued the UFC and demanded Brock Lesnar's fight checks as punishment.

So, when Hunt found out about Jones testing positive for his match against Daniel Cormier, the Super Samoan went off.

"DC should get all of Jones money," Hunt said ... before calling Jones a "betch" and a "cheating ass loser."

He then mocked Jones' bible verse tattoo -- saying, "Philippians 4:13 I can do all things through him who gives me strength plus the juice."

Jon Jones was devastated when he got the call about a positive steroids test -- so says JJ's teammate, who claims there's NO WAY Jones cheated and blames the whole thing on a "setup."

Frank Lester -- who trains with Jon at Jackson Wink in New Mexico -- says, "I was just at dinner sitting next to Jon Jones when he got the phone call about this failed drug test."

"Supposedly the story is between weigh ins and fight night he took an oral steroid. Which makes zero sense since it wouldn't do anything at all for Jon to do so. It takes weeks for steroids to build up in your system to be a performance enhancer. Jon was devastated to say the least."

"This is a setup, straight-up, no athlete would test clean his entire fight camp, and then randomly take some cheap f*cking oral steroid between weigh ins and fight night knowing he would be tested once he got done fighting."

"This is a straight setup. They are trying to ruin this kid's life. It makes no sense and Jon wouldn't do it."

Things got real heated between Conor McGregor and Paulie Malignaggi at a fight media event in Vegas moments ago -- with Paulie getting right in Conor's face, teasing him about his balls.

Paulie kept repeating to Conor, "Did you bring your balls?"

Conor reached out and put his hand on Paulie's shoulder and said, "You got your ass whooped. Get over it."

Paulie is furious with Conor for releasing a sparring video from his training camp which showed him knocking Paulie down in the ring.

Paulie claims the video was edited to make him look bad. Conor's camp says that's BS.

Paulie will be part of the Showtime announcing team working the Mayweather fight -- but Showtime says it's not worried about slanted coverage.

Serena Williams is getting hilariously loopy in her pregnancy ... like, laugh out loud funny.

With the baby due in roughly 2 weeks (or less) ... a very pregnant Serena used a Sharpie pen to draw on her stomach for a sports-style breakdown of how the birth is gonna go.

It's almost like if John Madden had to draw up and break down the delivery.

After that, Serena honed in on her baby daddy, Alexis Ohanian -- and pointed out the gray hairs on his beard.

Don't worry ... she's got a solution for how to make the gray go away -- and it's really funny!

Rev. Jesse Jackson is making a public plea to NFL owners -- do the right thing and sign Colin Kaepernick already!!

Jackson addressed the NFL's handling of the controversial free agent quarterback in an interview with BSO's Robert Littal ... and says Kaep is being wrongfully ignored by the league and its owners.

Jackson thinks the NFL is being hypocritical and treating players with criminal records better than Kaep ... but says it's not too late to make things right.

"Kaepernick should be playing football this fall of 2017 for somebody. Some owner should have the courage to do the right thing ... and get a good ball player at the same time."

Demi Lovato has signed on to sing the national anthem at the Mayweather vs. McGregor fight on August 26 ... Showtime has confirmed.

Lovato is a HUUUUGE fight fan. She's not only a regular at UFC fights, but also trains MMA at Jay Glazer's gym in Los Angeles.

She also just released her new single, "Sorry Not Sorry," last month -- so the timing is great for her.

Also, Diddy and Mark Wahlberg are making a $200k bet on the fight (doubling down on their Mayweather vs. Pacquiao fight bet).

Diddy has Floyd. Mark has Conor. Mark lost the first bet and paid the money to charity. Guessing it's the same plan for this fight.

Cleveland Browns tight end Seth DeValve -- the first white NFL player to kneel during the national anthem -- says he demonstrated on Monday night to support his African American teammates.

12 Browns players in total knelt in a circle before Cleveland took on the NY Giants -- the players included stars like Jabrill Peppers, Calvin Pryor, Isaiah Crowell, Kenny Britt and Duke Johnson.

But DeValve made the biggest splash ... just days after Michael Bennett said a white player kneeling would make the protest more effective.

DeValve -- who's married to a black woman -- heard Bennett loud and clear and heeded the call.

After the game, the Browns protesters explained their demonstration -- saying they wanted to come together as men to combat all the hate and injustice in the world.

Conor McGregor is literally puffing his chest at Floyd Mayweather -- showing off the crazy physique he's been training for ... with just days left until the biggest fight of his life.

The Irish superstar posed down at the UFC Performance Institute in Vegas -- saying, "The final rev of the engine on the Conor McGregor Fast conditioning program tonight! What a camp it has been!"

He then got into his green Lamborghini to cool off.

Lindsey Vonn is furious at whoever hacked her phone and leaked private nude photos online -- calling the actions "despicable" and vowing legal revenge against the scumbag who did it.

As we previously reported, the hacker not only found personal pics of Vonn, but also leaked an old private pic of her ex-boyfriend, Tiger Woods. He has also lawyered up and is going after all parties involved.

"It is an outrageous and despicable invasion of privacy for anyone to steal and illegally publish private intimate photos," a rep for Vonn told The Big Lead.

"Lindsey will take all necessary and appropriate legal action to protect and enforce her rights and interests."

"She believes the individuals responsible for hacking her private photos as well as the websites that encourage this detestable conduct should be prosecuted to the fullest extent under the law."

Miley Cyrus, Kristen Stewart and Stella Maxwell were also victimized by the hacker.

Victoria Azarenka has picked her baby over the US Open -- officially pulling out of the upcoming tennis tournament because she refuses to his leave the state without her 8-month-old son.

As we previously reported, Azarenka is in the middle of a nasty custody war with her baby daddy, Billy McKeague -- who hit her with court docs in L.A. The judge has ruled Azarenka can not take her kid out of the state until the trial is over -- which ain't gonna happen for a while.

The US Open begins next week in New York -- and rather than leave the baby's side for 2 weeks, the former #1 womens player has withdrawn completely.

"I am sadly unable to compete in this year's US Open due to my ongoing family situation that I am working through," Azarenka says.

Antonio Brown's longtime personal trainer has completely cut ties with the Steelers superstar ... saying working with A.B. is "bad business."

A.B. and Florida-based fitness expert Bo Smith were inseparable for years ... and the duo had documented their intense workouts on social media.

But that's all come to an end ... with Smith sharing news of the messy breakup on Instagram, saying "I had to walk away & remove myself from the bulls**t! Be a MAN of your WORD and own up to your WRONGS as a MAN should, Communication is KEY!"

He added ... "I've learned to walk away from anything or anyone that THREATENS my PEACE of MIND, SELF-RESPECT, VALUES, MORALS or SELF WORTH."

Unclear exactly what caused the rift -- but it doesn't sound good.

The situation sounds similar to Brown's split with his personal chef -- who split from the NFL star last year in a public, bitter breakup.

Smith should be able to rebound -- he's trained a laundry list of big athletes including Chad Johnson and Geno Smith.

Oakland Raiders head coach Jack Del Rio has Sean Smith's back -- sorta.

Del Rio was asked about Smith's arrest over an alleged July 4 beatdown of his sister's boyfriend and produced a possible defense for the cornerback.

"He was defending his sister," Del Rio told SFGate.com ... "Obviously, things occurred that were taken issue with, so he’s having to defend himself right now.”

TMZ Sports broke the story ... Smith -- who signed a $40 MILLION contract last year -- was arrested for felony battery in Pasadena after cops said he beat and stomped the man so badly he was hospitalized in critical condition.

Smith's lawyer says his client is innocent and will fight the charges -- but Del Rio's comments essentially confirm he did get physical with the other man. So, the "It Wasn't Me" defense is out the window.

But even if Smith was "defending his sister" -- the law only affords someone the right to use "reasonable force" to stop an imminent attack.

Based on the injuries the man suffered -- multiple broken bones, unconscious when police arrived, critical condition -- it sounds like officials believe Smith exceeded that standard.