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Celebs are pouring into T-Mobile Arena with the minutes ticking away to Mayweather vs. McGregor ... and it’s a roster fitting for the Fight of the Century.

A suited LeBron James came through with his wife Savannah ... and he wasn’t the only superstar athlete in attendance.

Alex Rodriguez and Jennifer Lopez -- decked out in all white -- might have had the freshest ride to the arena ... courtesy of Patriots owner Robert Kraft and his private jet.

Names like Bruce Willis, Vanessa Hudgens and Meek Mill are also live in Vegas to take in the fight.

No surprise -- they're all lookin' good. But who's the best dressed?

Conor McGregor has ARRIVED ... and he's rockin' a badass new hairdo!

Mystic Mac's gone back to the buzzed head ... the same look he had in his crazy win over Nate Diaz at UFC 202.

Of course, Conor's also suited up in a clean 3-piece ... a blue and purple joint from his personal designer David August. He's also got on his classic stunner shades -- even though he's indoors.

McGregor looks pretty confident struttin' into T-Mobile arena with the fam ... but did he have a better entrance than Floyd Mayweather?

Floyd Mayweather's first to the arena for his super-fight with Conor McGregor ... and he's DRIPPING in bling -- rockin' a fresh black and gold track suit.

Floyd partnered with world-famous fashion designer Philipp Plein for his robe and trunks with the same colors ... so we're pretty sure this is another Mayweather and Plein collab.

Money's also got on his LeFerrari Hublot watch -- which is worth a cool $1 mil.

Floyd seems pretty stoked to be in the building ... boogieing into T-Mobile with his TMT crew.

Malia Obama just arrived at Harvard, but she's having trouble blending in, especially Saturday when she felt harassed by a woman hell-bent on getting a photo.

Eyewitnesses tell TMZ, Malia was in Harvard Square with a friend. As she approached a salad shop, a woman ran up to her and said she wanted a photo for her grandchild. We're told Malia politely declined.

The grandma was undeterred and staked out the salad joint, waiting for Malia to leave. When she did, we're told the grandma trained her camera on the former First Daughter and Malia fired back, "Are you gonna take it in my face like an animal in a cage?"

Conor McGregor made his last chance to trash Floyd Mayweather count ... and now we know EXACTLY what Conor was dishin’ out at Friday's face-off.

Spoiler – he calls Floyd a bitch. A lot.

In between, McGregor disses Mayweather by saying he's “soft, little, short, weak” ... and in the worst shape of his career.

Floyd looked good to us ... but Conor won the battle of the bods below the belt.

We’ve seen chill Conor talk trash. Now we’ve seen crazy Conor do it.

Both are pretty great -- but which one will we see tonight?

Meek Mill went HARD at James Harden's birthday ... getting a crew of rap all-stars on stage at Drai's Nightclub in Vegas for The Beard's 27th.

Meek spit his "Dreams & Nightmares" track with Chance the Rapper, Jeezy, Trey Songz  and 50 Cent all chillin' next to Harden. The crowd ate it up ... not just for all the talent assembled on one stage, but because it appeared to include a truce.

Meek and 50 have been beefin' for a minute, but both seemed cool to kick it for the Rockets superstar.

The other MCs all got on the mic too, and even though the party did not feature fireworks ... we're guessing Harden loved this one more than his 25th with the Kardashians.

Daniel Cormier looked suspicious as he waded in the waters of Hawaii ... as the UFC light heavyweight championship belt hangs in the balance.

TMZ Sports broke the story ... Jon Jones may not have fought a fair fight when he KO'd Cormier last month and snagged the title ... turns out Jones failed an in-competition drug test -- testing positive for the anabolic steroid Turinabol.

Cormier is taking it easy while the powers that be decide Jones' fate. He could be suspended for up to 4 years ... and it's pretty clear he'll get his title yanked, and that it'll revert back to Cormier.

The luck of the Irish has run out in Vegas ... at least for those trying to find an Irish pub to cheer on their champion.

There's a strong Irish contingent in Vegas this weekend for the Floyd Mayweather vs. Conor McGregor fight, and for those who don't have the Euros to enter the T-Mobile Arena ... choices are limited.

Problem is ... free-standing Irish pubs don't have the dough to pay for the fight -- $10k -- so the only pubs that will do the trick are Ri Ra in Mandalay and Nine Fine Irishmen in New York, New York.

Tickets go for $165 -- and that doesn't include a drop of whisky! Sad to say, both pubs have been sold out for weeks.

There are thousands of Irish men and women in Vegas to cheer on Conor. Just look at this video from T-Mobile shot Friday.

Floyd Mayweather eats likes a horse ... because he can.

Floyd's chef, J. Santiago, tells TMZ, Floyd's eating is directly proportionate to his workouts. A typical breakfast includes eggs, home fries, grits, various breakfast meats including bacon, turkey sausage, turkey ham and turkey Kabasa, and pancakes.

Floyd's "obsessed" with spaghetti bolognese. He's had it pretty much every day leading up to the fight.

Other favorites ... BBQ chicken, baked chicken with rice and gravy and all sorts of soul food.

Before Friday's weigh-in, all Floyd ate were 2 bananas and all he drank was water.

After the weigh in ... that was a different story. Santiago says he had his spaghetti, BBQ chicken, green beans, rice, sauteed shrimp and peppers in garlic sauce -- and salad.

At 1:30 AM Saturday, Floyd got hungry so she made BBQ chicken, spaghetti, green beans and rice.

Unknown what the champ's eating today leading up to the fight. It's all about cravings.

Looks like Taylor Swift and Katy Perry's bad blood has finally been mopped up -- 'cause Taylor's new album throws no shade her way ... like, AT ALL.

Our sources tell us TayTay's 6th album, "Reputation," is devoid of hate or trash talking directed at her longtime foe. Anyone expecting another epic slash at Katy is going to be sorely disappointed.

On the surface it seems as if Taylor is taking a swipe at Katy. In her new song, "Look What You Made Me Do," Taylor sings, "I've got a list of names and yours is in red underlined." It appears she's making reference to the movie "Mean Girls," where Regina George's picture is in the burn book with the words, "She is a fugly slut" and underlined in red.

Katy raised the issue in a tweet directed at Taylor back in 2014 ...

Our sources say Taylor's album lyrics have nothing to do with "Mean Girls," Regina George or Katy.

Katy has recently said she wants to end her feud, so now it's all on Taylor.

The mystery ... we're told something big will happen at the VMAs ... and reading between the lines it would not be surprising if Katy and Taylor appear onstage and publicly bury the hatchet.

It makes sense ... Taylor will probably dig that hatchet right back up and go after Kim and Kanye.

Floyd Mayweather will be staring down several racks of cash hours after the fight with Conor McGregor -- win or lose -- 'cause clubs are throwing big bucks to get him to show his mug Saturday night.

TMZ Sports spoke with several Vegas promoters and the numbers are insane. One of them told us he'll pay Floyd $30k just to walk through his establishment ... for only 10 minutes! Another doubled that, offering $60k for a 30-minute pool party appearance on Sunday.

Sources close to Floyd tell us he already has 3 other offers -- for $50k, $80k and $100k. We're told the offers would still stand even if he loses because people would still want to chat him up.

Unfortunately for all those promoters, Floyd hasn't agreed to any of it. But we're told he WILL make some appearances besides his Girl Collection strip club party. If he accepts everything on the table -- which is logistically possible -- he could pocket a total of $320,000.

Finally the fight!!! And Taylor's now makin' Kim and Kanye her business. So we gotta ask ...

The Weeknd had a rough start to the weekend after his concert was shut down before it even started.

Weekend was supposed to perform at a downtown L.A. warehouse Friday night for a celebration of the 20th anniversary of Grey Goose.

Along comes the fire marshall, who examines the permits and realizes they were not in order. A half hour before the concert was supposed to start, the people throwing the event sent emails saying the concert was 86'd due to "production issues."

Some of the would-be concert goers went ballistic. One guy told the NY Post, "I showed up and like 30 girls attacked my Uber. There were all these hot girls standing around all dressed up and staff were carrying crates of Grey Goose out of the building."

The guy summed it up, "What a s*** show." Sounds like.

Jesse Williams' ex is hellbent on making sure he doesn't post photos of their kids on social media, and says his claim he has a First Amendment right to do it ... is total BS.

In new docs, Aryn Drake-Lee says Jesse's Instagram posts threaten their kids' welfare and safety. She points out Jesse has some 2.2 million followers and she's worried some might be volatile and obsessive fans who could harm their kids in an effort to get closer to Jesse.

Aryn previously raised this issue, claiming he's only touting the kids on IG for empathy. Jesse fired back he was exercising his First Amendment right -- but Aryn points out their children are not public figures and have their own rights.

She also says Jesse can't vouch for the mental state of his followers. To be clear, Aryn's cool with Jesse sharing pics with family and friends ... it's the public randos who concern her.

Lookin' to make some extra cash during the Floyd vs. Conor fight?? BET ON THE BOOBS ... 'cause Demi Lovato's twins highlight the fight's list of prop bets!!

The cyber-gambling site BetOnline.ag -- one of the biggest gambling sites on the net -- is offering up a bet on whether Demi will show cleavage or cover up the goods during "The Star-Spangled Banner" before the fight.

As of right now ... the odds are definitely pro-boob:

Yes +350 (bet $100 to win $350)

No -500 (bet $500 to win $100)

There's more (not as sexy) bets ... like over/under 1 min 52 seconds for her rendition of the anthem and whether the Biebs and Lil Wayne will make an appearance.

So we got a bunch of celebs out Friday night and they were almost singular in their prediction of the fight ... singular with one exception.

We got Nipsey Hustle, Yo Gotti, Casper Smart, Dominic Santana and Dorothy Wang out and about, and they all seem psyched for Saturday night.