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Katy Perry's concert took a scary turn Sunday night ... when a fan collapsed onstage just moments after being invited up.

Perry was performing in Detroit ... a little over an hour into the show, she invited a group of young fans onstage for a sing-along segment. One of the girls burst into tears, hugging Perry the moment they met.

Just before Perry began singing, the emotional fan went down. Perry immediately rushed to her side, crouching next to the girl along with security and other arena staffers.

Sorry, A.J. Green ... Chad Johnson tells TMZ Sports Ja'Marr Chase is the best wide receiver to ever put on a Bengals uniform.

The Cincinnati legend made no bones about it during a quick convo with our photog out in New York City this week ... saying Chase is "absolutely" the No. 1 "in the history of the Bengals."

"The franchise in general," he added. "Yes."

Before this lil' cutie with frosting on her face turned into a superstar, she was just playing in the Nebraska snow with her bro and dancing up a storm -- starting at 2 years old.

She's switched up her cool hairstyles over the years, but she's most notable for her hair bows. Her song "Boomerang" has over 1 billion views on YouTube. Because of her popularity, she scored her own cereal!

We're giving you the following clue last, because it oughta set you up for the slam dunk: She rose to stardom on "Dance Moms."

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If you're a LEGO fanatic, you'll wanna stick around! ... And if you're not, that's lame, but we can help you fix that!

LEGO is always giving its fans and customers iconic sets to build. Look below at some of the coolest pop culture sets you can get your hands on!

First on the list is a Disney Princess Beauty and The Beast Castle Building Set! 

Justin Bieber's not standing on business, he's standing on bullets ... because he went shooting out in the wilderness, and took his shirt off to fire off a bunch of ammunition.

Check out these photos the singer just posted on his social media account ... Justin's in the great wide open squeezing off rounds from rifles, shotguns and sidearms.

Justin ditched his shirt for the shooting spree ... and he brought some extra guns along ... because, as you can see, the dude is kinda jacked underneath all those tattoos.

The Biebs brought plenty of bullets with him ... just look at those huge ammo cans ... and it appears he was doing a little skeet shooting, at least when he had the shotgun in his hands.

Justin's been having himself one hell of a summer ... with lots of outdoor adventures with his family and friends ... and plenty of shirtless snaps.

Erik Menendez doesn't sound like he's getting the prison furlough he was hoping for ... because he's back behind bars after painful kidney stones sent him to the hospital.

Erik's daughter, Talia, shared an update on social media ... saying, "My dad is out of the hospital and back at the prison, preparing for our upcoming parole hearing."

We broke the story ... Erik left his state prison in San Diego last month and went to a hospital to undergo several surgeries to remove kidney stones.

Sydney Sweeney wears blue jeans and she votes red.

The actress registered to vote as a Republican in Florida a couple months before Donald Trump was elected president ... according to public voter records that are available online.

Sydney's politics have become a topic of interest for many in the wake of her controversial advertising campaign for American Eagle blue jeans.

It's getting hot and sticky out there ... and even celebs need a sweet treat to beat the heat!

We think a nice piece of fruit's always a good call on a nice day ... and apparently, so do Camila Cabello, Chris Appleton, and Jen Selter!

Hey, a little poolside snack sounds like a berry good idea too -- although it looks like Tia Mowry beat us to the punch!

We've got one question for you, though -- orange you glad we didn't skimp out on a hot shot of Kendall Jenner?!

Loni Anderson, who starred on "WKRP in Cincinnati" and was once married to the late Burt Reynolds, is dead.

The actress died Sunday at a Los Angeles hospital following what her longtime publicist, Cheryl J. Kagan, told the AP was a "prolonged" illness. The official cause of death is unclear.

In a statement to the AP, Loni's family says ... "We are heartbroken to announce the passing of our dear wife, mother and grandmother."

Diddy's ex-girlfriend Gina Huynh -- Victim No. 3 in the federal indictment who was a no-show in court after prosecutors subpoenaed her -- just went to bat for him in his bid to get out of jail pending sentencing.

In new legal docs, obtained by TMZ, Gina pens a letter to the judge in Diddy's criminal case ... supporting Diddy's motion for bail.

Gina says she's known Diddy for years and that she's mostly seen him as a father, family man and business man ... not a criminal.

Heidi Klum is celebrating a relationship milestone with husband Tom Kaulitz ... and they're partying hard.

The supermodel just posted videos and photos from her 6-year wedding anniversary celebration with the Tokio Hotel guitarist ... and there are bikinis, infinity pools, Champagne, gifts, kisses and club hopping ... oh, and some feet videos, for those of you who enjoy that sort of thing.

Heidi and Tom are somewhere in paradise celebrating their marriage ... and they look super happy.

Tragedy at an Oasis concert ... a man fell to his death at Wembley Stadium towards the end of a sold-out show.

The incident happened Saturday night in London and the Metropolitan Police say officers and medics found a man in his 40s dead from injuries consistent with a fall.

Cops say the man was pronounced dead at the scene. The call came in a few minutes after the show ended.

Sean "Diddy" Combs is firing back at federal prosecutors who want to keep him locked up at least another two months ... he says they're hellbent on punishing him for hiring adult male prostitutes and paying them handsomely to bang his girlfriends.

In new legal docs, obtained by TMZ, Diddy's legal team rips the feds ... claiming prosecutors are unfairly targeting him as they have throughout a "misplaced investigation"

Diddy's camp comes out firing ... "Impervious to the jury’s verdict, the government proceeds as though Combs was not acquitted of sex trafficking and racketeering conspiracy, along with all the racketeering acts with which he was charged and found not guilty."

Irina Shayk turned a stretch of Italian sand into her own personal runway ... stunning in some sexy swimwear.

The supermodel slipped her slim figure into a navy blue polka dot bikini Saturday and strutted her stuff around a beach in Capri.

Irina's got legs for days ... and she's wearing some Dolce & Gabbana here, which makes sense ... she was just in a D&G ad in Italy with Michele Morrone, and they were sucking face for the cameras.

Bobby V got a taste of the best party in Hollywood ... hitting up the TMZ After Dark Tour ... and it sounds like he was blown away.

Ray J was hosting Saturday night's tour when his longtime friend hopped on the bus for a surprise appearance.

The "Slow Down" singer told us he'd heard good things and wanted to support Ray ... and he gave a glowing review of the bus and the tour ... plus we got him to spill some tea on his love life.

Yeah, brotherly love might be a thing, but it's National Sisters Day, and when there are hot shots of celebs hanging out with their siblings ... well, we've got priorities here!

And it looks like it's gonna be a fun one, because we've got sisters like Kendall and Kylie Jenner soaking up the summer sun ... just like Vanessa and Stella Hudgens, who we caught rocking neon bikinis on an Italian getaway!