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From jam-packed celeb selfies and emotional speeches, to Best Picture announcement screw-ups -- Oscar's had some entertaining moments ... especially when they're not scripted.

We've gathered the Academy's most talked about moments over the past 90 years -- like that time Marlon Brando refused his Oscar, and when Jennifer Lawrence fell walking up the stairs to accept hers.

And, of course, we couldn't leave out Warren Beatty and Faye Dunaway's infamous flub -- 'cause ya gotta relive that one before Sunday night. Did you hear they're getting a second chance to nail it?

A student who survived the Florida shooting wants you to see how a single AR-15 bullet butchered his foot ... mangling it to pieces.

Kyle Laman -- who was inside Marjory Stoneman Douglas High when Nikolas Cruz opened fire and brutally murdered 17 people -- tells TMZ ... he damn near needed an amputation after a bullet pierced his right foot ... leaving a gaping and horrifying hole.

The 15-year-old freshman -- who will need at least 4 surgeries and a year of rehab before he can walk again -- described the excruciating pain he felt after waking up from one of his surgeries.

Kyle's mom, Marie, used the TV show "The Walking Dead" as a way of describing her son's injury. She's adamant -- no one in America who isn't old enough to buy a beer should be allowed to buy such powerful ammo. The family has now started a GoFundMe account.

Don't let these two almost identical images of Natalie Portman rip you apart ... combat this mission by seeing if you can pick out the differences between these two shredded shots.

These toasty takes will surely keep you nice and cozy during the last few weeks of winter ... blaze through our gallery of stars heating up by the fire to see who's bringing the heat.

Here's Johnny Manziel showing he's still got Heisman caliber hands ... except the skin he's palming this time isn't pig (at all) it belongs to the luscious cakes of his fiancee Bre Tiesi.

Manziel and Tiesi have been down in Miami hanging out -- and working out -- and this is the second time we've gotten a gander at Bre's gams (she killed it in a lime green thong yesterday).

This time the bikini is dark grey, which must be Johnny's color cause he had to get a little action, getting his five digits all up on Bre's backside as the couple chilled in a beach chair.

Nick Jonas' hot Australian mystery chick is a mystery no more -- and she's not just a smoke show, she's a smart one.

TMZ has learned her name is Annalisa Azaredo, and she lives in Sydney ... where Nick's currently on vacay with his brother, Joe. She's the epitome of beauty AND brains, too, having studied biomedical sciences at the University of Melbourne.

Annalisa's well-balanced though -- she knows how to have a good time, as you can see in the pics.

We broke the story ... Nick and Annalisa had a pretty hot date, spending the entire day together, despite her having a bloody cycling accident. Good thing they toughed it out .. the date ended with a bang.

Nick Jonas isn't gonna let a little thing like an open wound on a hot chick's knee crush his game, as proven by this footage of their epic day ... complete with public makeout sesh.

Nick and his bro Joe are gallivanting around Australia this week, but Nick went solo on Wednesday for a hot date that got off to a rough start when his date banged up her knees during a bike ride.

Not to worry, he rescued the sexy sheila (Aussie for babe) in distress by sweeping her off her feet -- and gnarly knee.

Nick and his chick did lunch, did the beach, did a romantic nightcap at Sydney's Watson's Bay Hotel -- then, most likely, did each other.

They didn't even try to hide their hot and heavy hook-up, and we're told they left together after the place cleared out.

Mariah Carey is living large ... in a 12,000 square foot mega mansion in Beverly Hills ... TMZ has learned.

Mariah just signed a long-term lease for the mansion and it don't come cheap ... $35,000 a month.

The house, which sits on one precious acre -- is pretty rad ... 9 bedrooms, a guest house, a 2-story foyer for dramatic entrances and amazing city views. It also has a spa ... seriously.

Carey moved on from the home she shared with former fiance James Packer.

The house had other famous occupants in the past ... notably, Nicki Minaj and Meek Mill.

Ain't nuthin' but a g-string baby ... and Johnny Manziel loves it!!

The QB hit the beach in Miami for a little fun in the sun with his fiancee, Bre Tiesi -- who turned heads in a tiny electric green bikini ... and it was gooood.

Manziel has been training his face off for his football comeback -- recently doing sand drills with his former Cleveland Browns teammate, Joe Haden.

Of course, Bre looks amazing ... but Johnny looks great, too -- putting back some of the muscle he had lost when he was partying his way out of the NFL.

Kim, Khloe and Kourtney Kardashian are making Tokyo their personal catwalk ... stuntin' all over the city in some pretty revealing fashions.

The double K krew are over in Japan, shooting for 'KUWTK,' and the sisters went on a daytime shopping spree Tuesday, before stepping out in some seriously stylish outfits at night.

Kim and Khloe channeled some Yeezy vibes during the day -- long trench coats, body-hugging short dresses, etc. -- but they switched it up when the sun went down.

One interesting wardrobe choice here -- a very pregnant Khloe, who opted for the exact opposite of traditional maternity wear.

Liev Schreiber is diving in deep with his new gf -- taking a sporty and sexy vacay down in Costa Rica.

Taylor Neisen, an ex-Miss South Dakota, was rocking a small blue bikini while she and Liev played frisbee and jumped around in the surf. The couple's been seen together since last fall ... when they were spotted out in NYC. Good move heading South for the winter.

The "Ray Donovan" star and Naomi Watts broke up in 2016, but they've successfully continued co-parenting their 2 sons -- who are on the trip with Dad and 26-year-old Taylor.