Party All The Time

Usain Bolt threw a massive gender reveal party in Jamaica -- with huge fireworks, a crazy dance party and TONS of people ... oh, and he's having a little girl!!!

"Yo, I just did the reveal and I'm a girl dad," Bolt said before threatening future suitors ... "Any man! Any boy! Don't play with me!"

The Olympic legend and his longtime girlfriend, Kasi Bennett, threw the bash at Peter's Rock in Kingston Monday night ... where guests got all sorts of cool Baby Bolt swag -- hats, shirts, etc!

There were tons of people at the party, including fashion stylist Neko Kelly who did a pretty great job documenting the action!

When the fireworks exploded -- they lit up the sky with bright pink flashes -- and the crowd went nuts!

Event planners handed out pink Baby Bolt hats -- and Usain got a special custom Girl Dad sweatshirt, which he proudly rocked around the party.

Usain and Kasi have been dating for roughly 6 years -- though, as you might recall, she famously gave him a hall pass during the 2016 Olympics in Rio.

"Sugar" Sean O'Malley hasn't whooped ass in the Octagon in 2 years ... so how's he gonna celebrate his win Saturday night? POT & PIZZA!!!!

25-year-old O'Malley was one of the UFC's hottest young stars ... but hasn't fought since March 2018 (he flunked a drug test after taking a supplement that was laced with a banned substance).

Despite the layoff, Sugar tells TMZ Sports his fighting skills -- and ridiculous support from fight fans -- haven't diminished at all ... and he's ready to kick Jose Quinonez's ass at UFC 248.

"It just feels like another fight. 2 years off is not that big of a deal."

O'Malley continued ... "I don't think anything's really changed. I don't think much has changed as far as the attention I'm getting, as far as how excited the fans are."

Snoop Dogg's one of those fans -- remember his "O'MALLEY!! O'MALLEY!!" commentary during the Contender Series? Awesome.

And, once the fighting's done Saturday night ... "Sugar" Sean says it's time to get high!

"I'm gonna take a rip, I'm gonna hang out with my circle. I don't have an after-party planned. I'm just gonna celebrate with some medicine and some good food and that's about it."

His post-fight grub of choice?

"I always crave pizza. I think a lot of fighters do for whatever reason."

Now, that's a plan.

Michelle Obama looked like she was having a spankin' good time at Christina Aguilera's Las Vegas show ... especially when one of the dancers twerked on her!!!

The former First Lady attended Christina's The Xperience Wednesday night at Planet Hollywood's Zappos Theater, and got singled out by one of Aguilera's shirtless male dancers while she was in the middle of singing "Lady Marmalade."

Michelle didn't seem to mind -- she mimicked delivering some butt slaps before the guy moved on, and she continued to dance in her seat. In fact, she and her friends looked like they wanted more ... more ... mooooore.

We're told Obama and her group of gal pals were escorted out by security after the show ... seemingly pleased with Christina's performance.

As for why the ex-FLOTUS was in Vegas ... she spoke earlier in the day at the Ultimate Software Connections Conference, so apparently her ladies' night out was the pleasure after the business.

"What happens in Vegas, stays in Vegas" just doesn't apply to her.

How did the New York Rangers celebrate Mika Zibanejad's INSANE 5-goal game Thursday??

LOCKER ROOM SURPRISE PARTY, BABY!!!

Zibanejad could not miss in NY's game against the Washington Capitals ... netting 5 goals, including the OT winner -- and afterward, his teammates celebrated in pretty cool fashion.

They all hid in the locker room at Madison Square Garden ... and once Zibanejad walked in -- they surprised the hell out of him with a moshpit!!

Watch the clip ... the guys go pretty wild -- even dumping a whole water bottle on the star center's head!!

Zibanejad has been red hot for the Rangers this season ... scoring 38 goals and tallying 33 assists in 54 games -- but his night against the Caps was ALL-TIME great.

Five-or-more goals in one game has only been done 62 times in the sport's history ... and only 46 players have EVER done it.

By the way, if you're wondering, Wayne Gretzky scored 5 or more goals FOUR TIMES in his career!!!

Madison Beer ruffled her own feathers on her 21st birthday ... and it was one helluva view.

The singer celebrated her big 2-1 Thursday night in WeHo in front of a star-studded crowd at Delilah nightclub. All eyes were on Madison ... she slayed in a baby blue, bejeweled, carnival-themed costume.

Madison had some stiff competition though in the attention department ... as in the birthday cake.

Baby blue seemed to be the color of the night as Hailey Bieber went chic business with high-knee leather boots. Hailey's hubby had a big hand in practically launching Madison's music career. Remember, it was Justin who 8 years ago tweeted a YouTube video showing then 13-year-old Madison belting out Etta James' "At Last."

The rest is history.

Tough scene for a super-rich guy sitting courtside in Boston on Tuesday ... Kemba Walker drilled him in the chest with an errant pass -- SPILLING HIS BEER EVERYWHERE!!

It all started when the Celtics superstar was trying to make a sweet play in the lane against the Brooklyn Nets ... when he fired a bullet to his teammate for an easy layup.

The problem? Romeo Langford couldn't handle the hot potato ... and the ball went crashing right into some dude's beer!

Check out the aftermath of the cold one's explosion ... the suds went all over the man's suit -- and some shrapnel even got on the guy next to him!!

To their credit ... both guys took the spillage in stride, smiling and laughing about it.

Hopefully someone replaced the drink ... 'cause that stuff ain't cheap in the NBA.

As for the game, the Celts ended up losing 129 to 120.

Luka Doncic might have lost his Mavericks game on his 21st birthday ... but he DEFINITELY won the after-party!!!

TMZ Sports has learned the NBA superstar got after it Friday night for his bday despite losing to the Heat ... hitting up Miami hot spots with his Mavs teammates and other celebs.

We're told Doncic and the guys got dinner at Papi Steak in Miami Beach before ultimately spending the night at Club LIV.

And, you can see in photos we obtained of the festivities ... Doncic was having a blast -- even at one point getting some partying in with Bad Bunny!!

We're told Mavs owner Mark Cuban threw an especially big bash for his team's best player ... taking over LIV's stage area and popping champagne all night.

As for how the hangover went ... the Mavs were off Saturday -- but Luka still took Dallas' game off against the Timberwolves on Sunday.

The team says it was because of a previous thumb injury ... but we're not so sure we're buying that.

Justin Bieber turned 26 this weekend -- and as much as you might think the guy had every reason to cut loose ... he kinda did the exact opposite when it was time to make a wish.

The Biebs' party went down Saturday night at Delilah in L.A. -- this after a reported 1-on-1 romantic dinner with the missus, Hailey -- where a bunch of their pals came out to help him celebrate the big 2-6. It looked like a sweet shindig -- there was a live band, drinks being passed around and, of course, lots of pastry sweets ... including candle-lit cupcakes.

He had a cake to himself though, and as everybody sang him "Happy Birthday," Justin looked a little ... dare we say, somber? Yes, some of that -- but mostly content and chillaxed.

He had Hailey right in front of him, naturally, and it appears he kept his eyes mostly on her the whole time. Clearly, the married couple is head over heels to this day. He was later seen cradling her from behind, and they snuck in some smooches where they could.

Even with a ton of cameras on them, they didn't seem to care. Justin and Hailey just couldn't keep their hands off each other as they hugged, kissed, swayed and canoodled. Young love at its finest, right?

Now, just to be clear ... it wasn't all lovey-dovey and heart eyes all night -- JB DID get down and bust a move at different points in the party. He also got on the mic for a bit, but for the most part ... Bieber seemed to be acting pretty freaking responsible and playing the good hubby all night.

Tyson Fury has finally returned home to England ... and turned the airport into a nightclub!!!

There were HUNDREDS of fans lined up to greet the 31-year-old heavyweight champ at Manchester Airport on Tuesday morning ... including a DJ who pumped music to the pumped-up crowd.

Fury LOVED IT -- and played along to the crowd as he continued to celebrate his victory over Deontay Wilder.

Tyson had a few marks on his face -- but overall, he looked pretty good ... much better than his last fight anyway (remember, they had to sew his face shut after that gnarly gash).

"Thank you, everybody, for coming to support me," Fury told the crowd ... "God bless!"

Meanwhile, Deontay Wilder has said he wants a 3rd crack at Fury and will exercise the rematch clause in his contract.

No word on when that will take place -- but whenever it happens, ya gotta think Wilder will cool it on the ring walkout costume next time around ... maybe get carried to the stage like Tyson!