Shawn Mendes and Camila Cabello have taken their PDA world tour on the road ... which begs the question -- do these two ever come up for air?!?

The "Senorita" singers headed North to Montreal for more QT. When they weren't holding hands on a nighttime stroll, they were gettin' it at a small cafe.

It's been nonstop spit swapping ... sucking face in SFO, cuddling in WeHo and taking it East to South Beach.

So, will summer love blossom in the fall, or fade into the sunset? The doubters say this is all a PR move to hype their song, "Senorita," but it's looking more and more like this is the real deal.

BTW ... "Senorita" is killing it on the charts ... it's number 2 on Billboard Top 100 ... it even beat out Lil Nas X.

Ronda Rousey is so tough, she BROKE HER FINGER on the set of the "9-1-1" TV show -- BUT NEVER BROKE CHARACTER!!!

Ronda -- who plays an L.A. Fire Dept. badass on the show -- was shooting a scene in Mexico last week in which she was supposed to slam a door during a dramatic action moment.

But, as one source put it ... "She was a little over-exuberant and slammed the door on her finger."

We're told Ronda didn't wince, didn't complain, didn't mess up the scene ... instead, she continued to stay in character and finished the scene.

Only after the director yelled "cut," we're told, Ronda FINALLY acknowledged the injury -- saying, "Ow. You're not gonna like this!"

Ronda went to a doctor who diagnosed her with a broken finger -- which is NOTHING for the former UFC superstar.

She got a splint for her hand and went right back to work the next day, our sources tell us.

Hollywood ... it ain't for the weak.

Heidi Klum and Tom Kaulitz can't keep their hands, or mouths, off each other on what's turned into a marathon of a honeymoon in Italy. Hey, don't let us interrupt!!!

The ex-supermodel and her new rock star hubby are STILL laying out on the high seas off Capri, where they've been enjoying the yacht life ... but, more importantly, each other ... as you can tell in these pics of them smoochin' and getting a little nakey on board.

Tom's kissing Heidi's thigh, she's kissing Tommy's abs ... and even some boring old school kisses on the lips. Like we said, lots of PDA.

BTW, Heidi has NOT been shy about losing the upper half of her outfits these past couple weeks -- besides going topless here, she also posted a kinda, sorta NSFW shot 2 days ago.

As the kids are saying these days ... #FREETHENIPPLE!!! More power to ya, Heidi.

As we reported ... Heidi and Tom got secretly hitched about 6 months ago. They had a big Italian yacht wedding a couple weeks ago with friends and fam, and have been there ever since. They're coming up on 3 weeks of honeymoonin', to which we say ... great work if you can get it!

The L.A. school funded by the Bill and Melinda Gates Foundation is about to face new claims of bullying -- including one incident involving a 14-year-old trying to kill herself.

Sources tell TMZ ... there is a new lawsuit about to be filed by the same lawyers at Geragos & Geragos who filed the first suit against the Animo Westside Charter Middle School. As TMZ first showed you ... that initial suit surrounds this video of one student choking another, whose parents claim he suffered permanent brain damage in the incident.

We're told the forthcoming suit documents the alleged bullying experienced by a now-14-year-old girl, who's claiming she too was mercilessly bullied last year on the campus ... and the school failed to stop it.

Our sources say the girl is claiming to have suffered both physical and verbal abuse from multiple students, with one girl leading the pack. We're told it got so bad, the alleged victim started cutting herself ... and months later, attempted suicide.

She had to be hospitalized on a psychiatric hold as a result. Her family is blaming the school as well as Green Dot -- the organization that operates the school.

Bill and Melinda Gates are not being sued, and neither is their foundation ... which has donated more than $7 million to Green Dot.

We're told the girl's family believes there is video of at least some of the bullying incidents she allegedly endured -- and their attorneys are working on getting their hands on it.

Our sources also say since we broke the story about the brain-damaged student ... several other parents have contacted attorneys with similar complaints about severe bullying at Animo Westside.

NBA superstar Russell Westbrook believes DRONES are the way of the future -- so he's made it a mission to help at-risk youth learn to pilot 'em ... TMZ Sports has learned.

Brodie's Why Not? Foundation teamed up with Chad Brownstein and the LA Conservation Corps to help "at risk young adults" in Los Angeles learn digital skills that will help them get good paying jobs in the tech field.

Not only will the students learn coding and computer engineering -- but he's also created an "advanced drone piloting career path program" ... which sounds AWESOME!!!!

"As a kid who grew up here in LA, I know how important it is to feel supported and empowered by the community," Westbrook said ... "By helping to provide these resources my hope is that the youth will be able to see how bright their future can be and expand the vision of what they think they’re capable of."

Westbrook and Brownstein are also funding a state of the art computer lab -- which is huge for kids who don't have the resources to learn computer skills on their own.

Todd Chrisley's daughter, Lindsie Chrisley, is concerned her family might come after her in the wake of her very public accusations of extortion -- so now, she's protecting herself.

Sources familiar with the situation tell TMZ ... Lindsie is taking the beef with her family so seriously she's hired an armed security guard who will protect her practically around-the-clock. The new muscle was front and center when we saw Lindsie Monday outside her attorney's Atlanta office.

She made no attempt to hide it ... she's concerned about retaliation, even from a family member.

Our sources say Lindsie even went to her local police dept. to voice her fear about her father or brothers getting violent after she accused them of extorting her with an alleged sex tape. She claims they were trying to coerce her into lying about their tax woes.

Our sources say Lindsie's spending $130/hour for her security guard, who is an off-duty police officer.

Despite having said she eventually wants to reconcile with her family, Lindsie's obviously worried about her immediate future. Her troubled brother, Kyle -- who's publicly supported Todd in this feud -- was arrested for battery back in 2012, when Lindsie claimed he'd hit her in the face.

Check out her response on how she's coping with all the family drama -- Lindsie tells us she's disgusted by her dad and brother ... and now it sounds like the bridge between them is toast.

A fish head left in the freezer is the reason Antonio Brown is allegedly stiffing a guy out of $38,000 ... so says the celeb chef who put it in there.

The story is wild ...

Stefano Tedeschi -- who filed a lawsuit against AB just last month -- tells TMZ Sports after cooking for the NFL superstar at the Pro Bowl in 2018, he left a salmon head in the freezer with the intentions of making some soup the next day.

The problem? Apparently, AB and his crew thought it was a threat -- and straight-up kicked him out of their mansion!!!

"The salmon head I thought was a joke," Tedeschi says ... "But, apparently, it was real."

Tedeschi says he had agreed to cook for Brown and all of his friends for 3 days in Florida during Pro Bowl weekend last year.

He says the first day went off swimmingly ... he cooked breakfast and lunch for Antonio and his guys -- and then came back later in the evening to do a big cooking show dinner.

Part of that meal included filleting a salmon -- one Tedeschi had bought with his son earlier in the day. But, when Tedeschi stored the head of the fish in the freezer after the show ... that's when he says all the trouble began.

"Apparently they misunderstood the fish head," Stefano said.

"I said, 'Who could have possibly misunderstood a fish head in the freezer? Tell me, what person with intelligence could have misplaced a fish head for some mob, horse head?!'"

Stefano says when he came back to cook the next day, he was booted from the property and wasn't allowed to retrieve any of his cooking gear that he had left on the premises.

Antonio also didn't allow him to cook the following day ... and, according to Stefano, the receiver never paid him a dime for the weekend.

As we previously reported, Stefano is now suing Brown for $38,521.20 for the weekend, and he tells us all signs are pointing toward an ugly legal battle in court to get the cash.

"AB's team is acting like we're going to go to court ... he's going to drag this thing out, he's got more money than me, blah, blah, blah."

We reached out to Brown's attorney, Darren Heitner, for comment on the fish head story ... and Heitner tells us, "There is no comment on the 'fish head' claim nor any other claim the plaintiff wants to make with the media."

Big bro is doing his damndest to lift lil bro Liam Hemsworth's post-breakup spirits with a little surf and sand Down Under -- problem is, doesn't look like it's working.

Liam and Chris Hemsworth hit up Byron Bay for a beach sesh ... it's their natural habitat, really. They went shirtless, as usual, while hanging with a group of friends and doing some boogie boarding on what looks like a perfectly great day -- despite Liam's glum face.

Chris looked like the life of the party while Liam seemed more brooding. Ya can't blame him, really, coming on the heels of his surprising split from Miley Cyrus ... which, as we first reported, has turned into a nasty, mud-slinging breakup.

Liam's been down in Oz hanging with Chris and his family ever since they dropped the breakup news about 10 days ago.

Liam hit up a bar with some mates over the weekend and looked a helluva lot more chipper during that outing. Maybe the beach just ain't calling him right now.

Colin Kaepernick says the 2015 shooting death of Mario Woods -- a black man who was shot multiple times by police officers -- is what compelled him to become a civil rights activist.

Colin told his story to Paper Magazine ... saying he was deeply affected by the incident, in which 26-year-old Woods was shot 21 times by 5 San Francisco PD officers during a Dec. 2, 2015 incident.

Cops confronted Woods -- who was holding a knife -- after receiving reports about a nearby stabbing.

Officers initially used non-lethal bean bag rounds on Woods while ordering him to drop the knife -- but then opened fire with live ammo when they claimed he became aggressive and was a threat.

But, cellphone footage posted after the incident appeared to contradict the police description -- showing Woods up against a wall while holding the knife at his side in a non-threatening manner.

A death investigation revealed Woods was shot 21 times -- 6 of those bullets struck him in the back.

The incident outraged citizens who accused the SFPD of executing Woods unjustly ... and according to Kap's girlfriend, Nessa, the QB began feeding his brain immediately after.

"If Colin wasn't reviewing a playbook, he was reading a history book," Nessa told Paper.

Kap took a knee in August 2016 -- 8 months after Woods' death -- and began his Know Your Rights Camp initiative that same year, using the Black Panther movement as inspiration.

Colin's KYRC has been thriving since their inception ... touching cities all around the country, and employing volunteers like Ava DuVernay, Taraji P. Henson and fellow NFL player Eric Reid.

Chris Morgan hasn't even entered the ring yet for his celebrity boxing match against Lenny Dykstra and he's already taking a big L ... over his viral nickname.

The angry little guy from the bagel shop has dropped his Bagel Boss moniker for next month's bout at the Showboat Hotel in Atlantic City after the Bagel Boss chain of cafes flexed on him, legally speaking.

The stores, in NYC and all over Long Island, fired off a cease and desist letter to Chris.

As you can see ... he now goes by The Angry Bagel Guy. It's not as catchy, but it still gets the job done.

According to the letter -- obtained by TMZ -- the lawyer for Bagel Boss demanded Morgan and fight promoter Damon Feldman stop using its name for ads and promos for the event or risk getting sued for trademark violation.

We've learned that within hours of the legal threat being sent Monday, the changes were made and the Bagel Boss nickname was axed and replaced with the new one.

It's unclear if it'll be enough to ward off a lawsuit, though ... because the letter also demanded a public statement declaring Morgan has no affiliation with Bagel Boss. So far, we haven't seen it ... and there are still some old social media posts referring to him as Bagel Boss that have not been removed.

As we've told you ... Morgan signed on with Feldman to be part of his upcoming celeb boxing event after going viral earlier this summer for ranting against women on dating sites, challenging a couple of guys to fight and promptly getting his ass kicked.

He dug himself a further hole personality-wise during subsequent interviews -- including with us -- but managed to land the fighting gig. Former MLB star Lenny Dykstra was named Morgan's opponent last week and has already teed off on him ... with some micro-penis jokes.

Before this brown-eyed girl was topping the charts, selling millions of records and winning a Grammy ... she was just an aspiring young singer from Boca Raton, Florida.

She got her start on Broadway in 2008 in the musical, "13," before rising to TV stardom on a pair of Nickelodeon shows. While acting, she also signed on with Republic Records and released her debut album in 2013, which included her first top-ten single ... featuring one of her famous ex-boyfriends.

Speaking of exes, this dangerous gal has several songs inspired by her relationships with them ... including her first number-one single last year.

The brunette pop star would follow it up with another number one, and go on to become the first solo artist to hold the top 3 spots on the Billboard Hot 100 at the same time.

What seemed like a major troll job on President Trump is now picking up steam, which is why Larenz Tate says if NYers want Trump Tower to face President Obama Ave. ... then make it so.

The veteran actor, who's now playing an NYC Councilman on "Power," was outside Facebook Monday in the Big Apple when we brought up the petition demanding the name change for 5th Avenue.

The petition -- which only aims to change the block of 5th Ave where Trump Tower sits -- already has over 430,000 signatures.

Larenz told us the people in power shouldn't ignore the proposal ... especially if citizens continue to show strong support for it. In fact, he's down for the city to go above and beyond the petition's request. Watch.

Petition organizers are aiming to lock up another 20k or so signatures to bring the initiative to Mayor Bill de Blasio and city council.

Larenz knows a thing or two about the process, thanks to his "Power" character. He also knows his own limitations as far as who he can and CAN'T portray on camera, including Barry O.

NASCAR dropped an awesome "thanks for saving our legend" gift over the weekend ... donating tickets to the first responders at Dale Earnhardt Jr.'s plane crash -- and seems they loved the gesture!

44-year-old Junior was involved in a fiery plane wreck last week, where he, his wife, his daughter and two pilots miraculously survived when their aircraft went down in Elizabethton, Tennessee.

Everyone involved in the accident thanked the town's first responders for making sure they all got out OKAY ... and as a present, NASCAR gave them tix to Saturday night's Bass Pro Shops NRA Night Race at Bristol Motor Speedway.

"We had a great time with our first responder family at the BMS night race!" The Carter County Sheriff's Office said.

"A big thank you to NASCAR for giving us and all the agencies that responded to Dale Jr.'s plane crash free tickets!"

Dale also chimed in with a thank-you message of his own -- breaking his silence on the crash -- writing Monday, "We are truly blessed that all on board escaped with no serious injuries, including our daughter, our two pilots and our dog Gus."

"I am thankful for the quick response of my pilots, local law enforcement, emergency personnel and hospital staff."

Chris Brown doesn't have to worry about a criminal case against him in Florida anymore -- the charge for allegedly sucker punching a photographer has been dropped.

It's a huge win for the singer, who got arrested last year after the altercation with a photog in a Tampa nightclub called AJA Channelside. We got some video of the alleged incident, but the State's Attorney's Office tells us, "After a thorough review of the facts and information from the alleged victim, our office determined there was insufficient evidence to prosecute."

More specifically, sources with knowledge of the case tell TMZ ... the photog "lacked credibility."

In case you need a refresher, Chris was booked to appear at the club, and according to club management ... Chis and co. were pissed the photog was snapping pics of them when they'd already tried shutting him down and refused any photos. Apparently, the guy kept at it while Chris was in a DJ booth, and CB allegedly lost it.

The photog says Chris socked him in the mouth, and caused some gnarly injuries. Chris was able to leave that night uncuffed, but about a year later ... he was nabbed by cops on an open warrant for his arrest when he returned to the Sunshine State.

As we reported, officers were waiting in the wings at Chris' concert in West Palm Beach last year, and after he was done performing ... they took him in to the station, where he posed for this mug shot. He was released shortly afterward on $2,000 bond.

Chris has gotta be happy about this -- considering he's still got an open rape investigation going on in France. He has not been charged there.