NFL

Justin Timberlake's been rehearsing his ass off for the Super Bowl LII halftime show, and TMZ has the first video ... which gives you a sneak peek of what's about to go down.

Sooo, HERE'S YOUR LAST WARNING ... SPOILERS AHEAD!!!

Sources inside rehearsal tell us JT did 4 run-throughs, just on Thursday. We're told one was a dress rehearsal that was taped for emergency ... just in case anything happens to JT and he can't perform.

This video is from one of his Thursday sessions, and one thing's for sure ... there's gonna be a TON of fireworks inside the U.S. Bank Stadium.

Our sources also reveal there are no 'NSYNC or Janet Jackson cameos planned ... so anyone hoping for a reunion or redemption ... you can pretty much abandon all hope.

HOWEVER, we're told Justin does have one pretty cool trick up his sleeve -- a hologram to honor ... wait for it ... Prince, in his hometown.

Of course, plans and strategies can change ... but an overhaul at this point seems unlikely.

P!nk's cleavage and Donald Trump's Twitter fingers can both get you PAID during this year's Super Bowl ... if you're willing to throw down some bread on prop bets!

There are a ton of wild wagers on the big game ... and, like they've done in the past with Lady Gaga, Beyonce and Katy Perry, BetOnline.ag is letting fans risk it all on whether P!nk's girls show up during the national anthem.

Right now ... the chances that they make an appearance aren't great.

Yes +260
No -350

Want better odds? Trust in POTUS... it's almost even money Trump fires off 5+ tweets on Sunday!!

Over 5 1/2 tweets +100
Under 5 1/2 tweets -130

Some other gems ...

-- Which quarter the announcers first mention Trump

-- Whether or not Justin Timberlake rocks a beard

-- The color of Bill Belichick's shirt (read: hoodie)

If ya still ain't sure where to put your money ... we also got some tips from Sportsbook Review betting experts Jimmy the Bag and Peter Loshak.

Lonnie Ali flew into Minnesota Friday, presumably for the Super Bowl, and as good as Tom Brady is ... she clearly thinks the title "The Greatest" belongs to her late husband Muhammad Ali.

Lonnie acknowledges Tom's kind of the shiny bright object of the moment, but putting him in a larger context -- he's not at the level of Ali.

She does acknowledge ... the book isn't closed yet on Brady, and he could ascend to greater heights, especially if he does great things outside football.

Rae Sremmurd doesn't give a damn about watching football -- so what's the one thing Swae Lee wants to see on Sunday??

"A titty comin' out like Janet Jackson!"

We got Swae and Slim Jxmmi touching down in Minny for the Super Bowl -- or maybe just the halftime show ... 'cause when we asked about SBLII, they seemed WAY more hyped on Justin Timberlake's set.

Specifically, a Nipplegate sequel.

"That was like the most epic Super Bowl, in my lifetime at least," Swae -- who was 10 when JT famously exposed Janet's breast on live TV -- told TMZ Sports.

Good news for Swae -- the NFL told us JJ is NOT banned from the Big Game.

The Tom Brady of boxing is Roy Jones Jr. -- so says Roy Jones Jr. ... who broke down why he and Tom stand out among the G.O.A.T.s in their respective sports.

"You have to be able to rate people by how they perform under pressure, when things don't go their way," Roy told TMZ Sports.

Case in point -- Brady rallied the Patriots from 25 points down in last year's Super Bowl ... and RJJ told us there was a time in his career where he accomplished something similar.

As for the Brady of MMA ... Roy agrees with Dana White and says it's Anderson Silva -- who he's still gunning to face inside the ring.

RJJ didn't have an official update on that super-fight, but he did hint at making progress with Dana -- who, FYI, has agreed to broadcast his Feb. 8 "retirement fight" vs. Scott Sigmon on UFC Fight Pass.

Did Kareem Hunt and Pat Mahomes just become best friends??

YEP!!

TMZ Sports spoke with the K.C. Chiefs breakout star about his new QB, now that Alex Smith got shipped to Washington ... and Hunt says he's totally stoked to play alongside Mahomes -- his "best bud on the team."

Hunt -- who led the entire NFL in rushing yards in his rookie season -- says he's gonna miss Smith ... but already has his eyes set on a return to the playoffs with Mahomes.

No word on whether Hunt and Mahomes have done karate in the garage.

Kevin Hart pulled a great escape Friday ... narrowly dodging a passenger train!

For one scary second, it looked like Kev might become the first casualty of the Super Bowl LII events in and around Minneapolis. We got him leaving Cowboy Jack's in downtown, and started talking about the "Martin" reboot. Kevin was so excited to talk about it ... neither he, nor our photog, noticed the light rail train coming down the tracks.

Watch his security team spring into action, but really ... you gotta watch for the look on Kevin's face when he hears the train's horn sound.

If President Donald Trump decides to take a last minute trip to the Super Bowl -- don't expect Minneapolis mayor Jacob Frey to lead the welcoming party!

For those unfamiliar ... 36-year-old Frey has made headlines for speaking his mind -- most recently when he made a video in which he asked if the city was really welcoming "f**king Eagles" fans to Minnesota.

So we asked if he would welcome Trump, too ... the answer? Not so much.

Frey did, however, say his dream celebrity meet-and-greet would be Snoop Dogg -- saying a Gin and Juice session with the rapper is on his bucket list!

... Unless Snoop suddenly becomes an Eagles fan.

Le'Veon Bell says he doesn't wanna play anywhere but Pittsburgh ... but he wants a long-term deal ASAP 'cause the whole process is wearin' him out.

"I just wanna get a deal done. I'm tired of having to deal with this every year," Le'Veon told TMZ Sports at EA Sports' Pre-Super Bowl party in Minny.

Remember -- Bell skipped the entire preseason 'cause he wanted the Steelers to pay him what he's worth. Ultimately, he ended his holdout and signed the franchise tag for $12 mil.

But good news for Steelers fans -- the superstar RB told us they're "in a better spot" with negotiations than last offseason ... so stay tuned.

Some of the biggest stars in the NFL are weighing in on Tom Brady's father/son smooch ... the smackaroo that made a lot of people go "oh, ummm ok," when they saw it.

The PDA went down on Brady's Facebook show, "Tom vs Time" when TB planted one on his 10-year-old son, and the duration of the kiss for a lot of people watching was frankly ... weird (sorry, Tom).

We talked to both Travis Kelce and NFL Hall Of Famer Willie Roaf, and when we asked each man about the father-son kiss, they protected Brady like he was in the pocket for their squads.

Kelce did give Tom a little advice though, and it's pretty hilarious.

Good news, Browns -- not every top QB in the draft is scared of becoming the face of your franchise ... and that includes Baker Mayfield!

We got Baker at EA Sports' pre-Super Bowl party in Minny ... and the Heisman winner told us why he'd "absolutely" welcome an opportunity to do better than Johnny Manziel.

FYI, there have been rumors the top 2 QBs on the board, Josh Rosen and Sam Darnold, both ain't down with the Browns.

Speaking of Josh and Sam, Baker says he's every bit as good as those guys ... and (BONUS) told us something that makes us think things are getting serious with his hot new GF, Emily Wilkinson.

Joey Fatone is so dead serious Justin Timberlake is NOT reuniting 'NSYNC during the Super Bowl halftime show, he bet our photog $1,000!!!

And the best part ... the bet was made IN MINNESOTA ... just a few miles from the site of the big game!

JT and Joey have been denying it for months, but rumors are swirling and our photog is clearly convinced Justin's getting the band back together on Sunday.

So, when Joey called our guy out Thursday night -- our guy put his money where his mouth is.

Better hope Lance, Chris and JC hop on a flight quick ...

Kirk Cousins is opening up about the blockbuster trade ... telling TMZ Sports why he's bummed to leave Washington but stoked about getting courted by guys like Von Miller.

With the Redskins trading for Alex Smith, Cousins is moving on -- he's the hottest player in free agency by far.

Cousins says he understands why Washington did what they did -- "Team's gotta do what's best for them" -- but says he'll really miss the people in Washington he's known since 2012 ... from teammates to the team chaplain to neighbors in the community.

Watch the clip -- you can tell Cousins is emotional about it.

The good news ... Von Miller has been saying he REALLY hopes the Broncos make a move for Cousins ... and Kirk's flattered.

"It's flattering to hear a player of Von's caliber speak nicely of me."

No one can physically be two places at once, but Travis Scott is going to come pretty damn close Saturday before the Super Bowl.

The rapper has 2 gigs scheduled for the same night ... and they're about 1,500 miles apart. First, Travis has a show around 10:30 in Minneapolis, which is then followed by a show at 1:30 AM in Vegas Marquee Nightclub in The Cosmopolitan ... plenty of time for both.

Sources close to the rapper tell us, in order to lock Travis down, promoter Jefferson Agar of Twin Cities Live had to make sure he could attend both gigs. We're told they shelled out around $50k for a private jet that'll take Travis from L.A. to Minneapolis and then to Las Vegas ... all in the span of a few hours.

Tix are still available for Scott's Super Bowl gig ... so if you've ever wanted to see a time traveler -- or the next best thing -- you've still got a chance.

We all know what Bill Belichick's wearing on Super Bowl Sunday (hoodie) -- but his girlfriend Linda Holliday is going with A LOT more flair ... with a custom crystal outfit, and TMZ Sports has the pics!

Linda hit up Leah Miller at Bella Artistry who makes custom Swarovski crystal fashion items for a TON of athletes and their significant others ... and ordered up some fresh gear for SBLII.

Holliday will be wearing a special blazer with her BF's last name spelled out across the back and his initials on the arm. We're told the blazer has 3,500 crystals that were all hand-placed, one-by-one.

She also got a blinged out purse complete with 1,200 Swarovski crystals!

Bill's boss is a fan of Leah's work as well -- Robert Kraft is getting a special crystalized pair of Nikes ... customized for the Pats owner himself with 13,000 crystals!!!

Now all they need is another ring to match!

It's been a few years ... but Vernon Davis is reuniting with his old 49ers QB Alex Smith in Washington -- and he couldn't be more excited about it.

"He's gonna be great for us," Davis said at a Super Bowl event in Minneapolis ... "Fantastic!"

Davis and Smith played together back in San Francisco -- but were each shipped out over the years.

Now, Davis says things have come "full circle" and he's hoping they can get to the Super Bowl next year.