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Nicole Scherzinger did her best Jessica Alba impression over the holiday weekend, showing off her incredible bikini body aboard a yacht in St. Barths.

At 35 years old, the former Pussycat Doll still has several lives left in her.

Justin Bieber and his abs hung out with billionaire Sir Philip Green aboard his yacht in Monaco this weekend ... appearing quite chummy.

It's a funny pairing -- Green made his fortune off clothing (Topshop) ... and JB rarely wears any.

Emma Watson was the safest student to receive her degree from Brown University on Sunday ... because she had her own armed security guard with her in the audience!

Watson was among 2,000 students to graduate this weekend, but we're guessing she was the only one who employed private security ... cleverly disguised in her own cap and gown.

Expecto Patronum only gets you so far.

Justin Bieber luxuriated on a yacht in Monaco Saturday.

Bieber looked more ripped than ever as he took a break from the Monaco Grand Prix, kicking back and drinking a brewski.

As we reported ... sources very close to the singer tell us he's off Sizzurp ... in no small part because it screws up his workout routine. One source very close to Biebs says in the past 3 weeks he's been like a different person.

Cutting out Sizzurp ... it does a body good.

A pantsless Lady Gaga took her new French Bulldog Asia for a stroll yesterday outside her Winnipeg, Manitoba hotel ... and seemed to have a hard time getting the cute pup to walk.

Now that she doesn't have to sit around a table and pretend to care what 3 other chicks think, Barbara Walters has plenty of free time ... to go shopping!

The 84-year-old former newswoman was seen walking around Manhattan on Wednesday after shopping at Rene Couture Jewelry & Handbags on Madison Avenue (she made a lot of money in 53 years).

We imagine Babs had a MILLION questions ... and probably made a salesperson break down in tears.

28-year-old Venezuelan fitness model/Instagram star Michelle Lewin reminded everyone that bikini season is almost upon us ... by wearing one in Miami this week in a way few can.

Chris Martin is either back with Gwyneth Paltrow or not ... and based on what Chris said Tuesday night both options are plausible.

Photogs wanted to know if pics of the consciously uncoupled pair on May 17 signaled a reconciliation ... and he consciously hinted it might be true.

But then he warned everyone not to jump to conclusions ... which the photogs immediately did.

Neither Chris nor Gwyneth have pulled the trigger and filed legal docs to end the marriage.

Here's Tom Cruise (left) seen out to dinner in London where he's promoting his new movie, "Edge of Tomorrow" ... and John Travolta (right) leaving a party last summer.

Reese Witherspoon put her checkered (and awesome) past with cops behind her today ... and donned a police uniform ... right here on American soil!

Reese is playing a police officer in her new movie, "Don't Mess With Texas" ... alongside Sofia Vergara. They're filming down in Louisiana -- where Reese recently did some Karaoke with Kenny Chesney.

Sofia definitely looks like she needs to be frisked, but Reese ... make sure you know her name before slapping the cuffs on her.

Who's obstructing whose justice now?

Sum 41 frontman Deryck Whibley is a shell of himself -- looking shockingly frail today as he leaned on others for support ... days after admitting he nearly died from years of hardcore drinking.

Deryck had to be held up by two women during a walk in Los Angeles.

On Friday, Deryck revealed he'd been laid up in a hospital bed for a month, and confessed on his blog... "the reason i got so sick is from all the hard boozing i’ve been doing over the years. it finally caught up to me."

Deryck says his liver and kidneys collapsed, and docs have told him if he has one drink he will die.

The damage is obvious when you remember how Deryck looked in his heyday with Avril Lavigne.

The difference between Leonardo DiCaprio in a nightclub and everyone else -- including Justin Bieber -- is pure numbers.

Leo had the ear (and probably a lot more later) of hot chick after hot chick last night in Cannes -- as he held court at Gotha Club ... which, based on photos, does not allow any women under an 8.

The Biebs was also in the club doing his shirtless routine.

Probably not the best look ... especially when Leo's in the house doing his thing.

Justin Bieber and Paris Hilton are NOT banging ... in fact, she couldn't stand to spend more than a half-hour with him because he wouldn't stop playing his own songs ... TMZ has learned.

Paris and Justin partied in Cannes Sunday night at Gotha Nightclub. There are reports that the 2 got cozy ... with the 33-year-old climbing into Justin's 20-year-old lap ... then leaving for his house.

But here's the deal. We're told 50 people went back to Justin's house -- Paris was never alone with him. And something else we were told ... she said the party was lame and couldn't stand the fact that Justin was playing his own songs ... so she left after half an hour.

Paul Walker's brother Cody made Malibu beachgoers do a double take Monday as he shot scenes with Tyrese, Vin Diesel, Ludacris and Michelle Rodriguez for "Fast and Furious 7."

Cody is filling in the gaps ... shooting Paul's unfinished scenes. As TMZ first reported, Cody and his brother Caleb will also do voice work to match Paul.

Walker died November 30 while the film was still in production.

In what appears to be a reminder about who won the war over Tom Brady, Gisele planted a big fat kiss on the QB's face this weekend ... right in front of his OTHER baby mama.

Ouch.

Tom and Gisele ... and Bridget Moynahan ... were all out together at a park in NYC hanging with all of Tom's kids (2 with Gisele, 1 with Bridget).

To be fair, Gisele and Bridget actually hugged each other at one point, but c'mon ... it's sorta like when Kobe hugged Shaq ... not a lot of feeling behind it.

The history between the 3 is interesting ... Tom started dating Gisele 8 years ago ... while Bridget was pregnant with his child.

Kim flashed her engagement ring for photogs ... and then she gave 'em the same rearview wedding guests will see walking down the aisle -- and it's glorious.