Bezos Sanchez Wedding

Kylie Jenner, Oprah, Usher and Bill Gates are ready to see some amore in Italy ... because they're piling into boats on the Venice canals en route to the wedding ceremony for Jeff Bezos and Lauren Sanchez.

It's a who's who of Hollywood celebs and billionaires Friday in the Floating City ... and ya gotta see how Jeff and Lauren's famous friends are dressed up for their big day.

Kylie, Oprah, Ellie Goulding, Kim and Khloe Kardashian, Jewel, Karlie Kloss, Ivanka Trump and Kris Jenner are putting on for the ladies ... and they're all glammed up.

Orlando Bloom is playing it cool at the Jeff Bezos and Lauren Sanchez wedding ... he's single after splitting from Katy Perry, but we've learned he's not trying to hook up with other wedding guests.

Our sources tell us Orlando is being very guarded in the way he's dealing with women in Venice ... even though he's around some very sexy, single and eligible celebs.

Orlando's in the midst of party central at The Gritti Hotel in Venice ... but he's mostly been bro'ing out with Tom Brady, Leonardo DiCaprio and Scooter Braun.

The weather is currently clear in Venice, Italy, for Jeff Bezos and Lauren Sanchez's mega wedding ... but Kylie Jenner is ready to steal some thunder!

Superstar guests are currently making their way to the lavish ceremony on the historic San Giorgio Maggiore island ... and it sure looks like Kylie is on her way to turn some heads.

KJ posted a short vid on her IG Story just a few minutes ago aboard a boat we presume is on the way to the island ... looking pure fire in a cream and white-colored corset totally highlighting her assets.

Tom Brady, Leo DiCaprio, Orlando Bloom and Sydney Sweeney are in the thick of party central at the Jeff Bezos and Lauren Sanchez wedding in Venice ... and it sounds like Tom's making a move.

We've learned the most hopping place in the Floating City is The Gritti Palace ... a landmark waterfront hotel where a collection of Jeff and Lauren's most famous friends are staying -- and it's the place to be for wedding guests looking to party.

Sources who are there tell us Tom, Leo, Orlando, Sydney, Jerry Seinfeld, Oprah, Charissa Thompson and the Kardashians are all staying at the Gritti ... and Sydney is the "center of attention" for single guys, including TB12.

Jeff Bezos is keeping it classic on his wedding day ... because he's rocking a tuxedo.

Check out these photos of Jeff before his star-studded wedding to Lauren Sanchez Friday in Venice, Italy ... dude's looking dapper.

Bezos is smiling and waving ... pairing some circular rimmed sunglasses with his black-and-white tux.

Brooks Nader is arriving in Venice in style ... stepping out in the Floating City on Friday wearing a black dress that fits her body like a glove!

Check out our gallery -- the Sports Illustrated Swimsuit model is heating up the town ahead of the luxe Bezos-Sanchez wedding ... giving a glimpse of her chest with an ultra-low neckline.

She's pairing the daring dress with a white clutch, black sunnies and black strappy sandals. She's all smiles ... seemingly not worried that all eyes are on her as she rides off in a water taxi.

Tom Brady and Orlando Bloom are making it easy for all the single ladies in Venice ... with the two bachelors cruising around town in the same water taxi ahead of Jeff Bezos and Lauren Sanchez's wedding!!

The NFL G.O.A.T. and British actor kept it casual as they hopped in a boat together on Friday ... with TB12 rocking a white shirt, black shorts, green hat and some Nike sneakers -- and Bloom electing to bare his arms with a black tank and shirt and white shorts.

The hunky stags were accompanied by friends -- including Scooter Braun and Alex Spiro -- for the ride through the canals ... although it's unclear where exactly they were headed.

Jeff Bezos and Lauren Sanchez can't buy everything in the world with Amazon money, it turns out ... 'cause the island they're getting married on isn't closed completely!

Sources with direct knowledge tell TMZ ... businesses on one side of the island of San Giorgio Maggiore -- including two museums, the sailing club and a café -- are open all day and will close at normal times, and the side of the island they're on won't be shut down for the event.

However, the islet is set into two pretty distinct parts ... with one half covered by businesses and the other dominated by the wedding grounds and the Teatro Verde amphitheater, as well as sprawling greenery. It's unclear whether the Basilica itself -- where the couple is reportedly going to take their vows Friday -- is open to the public during the daytime.

Lauren Sanchez is showing off major BLING before her star-studded wedding to Jeff Bezos Friday in Venice, Italy ... we're seeing a close-up shot of her flashing two giant rocks on her digits.

The bride-to-be was photographed in Venice today with gigantic diamond rings on both her ring fingers. One appears to be a pillow-cut, the other -- on THAT finger -- is an oval the size of an egg.

As you know, the impending nuptials have brought out a galaxy of stars and celebrities.

7:50 AM PT -- Sources close to Orlando Bloom tell us the woman pictured with Bloom is Hollywood stylist Jamie Mizrahi, who works with many celebrities, including Katy Perry.

TMZ can confirm there is nothing romantic going on between Orlando and Jamie -- we're told her husband Nico Mizrahi was with them when these pics were taken -- and the three friends have been enjoying their time together during the wedding festivities in Venice.

Orlando Bloom is single and ready to mingle at the Bezos-Sanchez wedding in Italy ... and mingle he did!

Check this out -- fresh off his split from Katy Perry, the British actor looked to be getting cozy with a mystery brunette Thursday night as they took cover from Venice's torrential rain in a water taxi.

Let's be clear ... the pair weren't doing anything naughty -- but the snapshot had them getting pretty close in the vehicle.

The rain in Venice brought out a beautiful sight Friday morning ... not a rainbow, but the gorgeous faces of Hollywood's A-list instead.

A few of the guests who will attend Jeff and Lauren's impending nuptials went for a stroll along the canals in Venice ... including Sydney Sweeney, who flashed some skin in a leggy and low-cut black dress.

Leonardo DiCaprio's longtime partner, Vittoria Ceretti, proved a rose by any other name is just as sweet ... even the roses on her dress -- a sweet addition to her skintight gown.

Katy Perry is M.I.A. from all the wedding festivities for Bezos-Sanchez this week in Venice, Italy ... but one person who hasn't forgotten about the singer is Lauren herself!

The world's most famous bride hopped on Katy's Instagram to comment on a pic Perry posted Friday, showing her with a cute as a button quokka -- an animal that only lives in Australia.

Lauren gave Kate a short but sweet shout-out in the comments, writing ... "We miss you Kate" with a heart emoji.

Lauren Sanchez took center stage in Venice Friday as she prepared to take her vows hours later with Jeff Bezos.

Sanchez blew a kiss to onlookers as she left the Aman hotel, where she and Jeff had been staying.

The ceremony will go down in front of around 200 people Basilica of San Giorgio Maggiore on the island of San Giorgio Maggiore -- it's a 16th-century church.

Jeff Bezos and Lauren Sanchez made it crystal clear no grumpy locals were gonna rain on their parade ... but Mother Nature had other plans, literally soaking them before their big "I do."

Catch the clip ... Jeff and Lauren got hit with a serious downpour after their Italian rehearsal dinner bash Thursday -- the billionaire holding onto his bride-to-be with one hand and sporting an umbrella in the other as they scrambled to a water taxi.

There were a bunch of security guards hovering to make sure the soggy dash went off without a hitch -- but all good, Jeff and Lauren looked totally chill as they kept the party going.

Jeff Bezos and Lauren Sanchez are kissing like there’s no tomorrow -- playing lovestruck teens while cruising to their fairy tale wedding rehearsal in Venice … while all the world watches.

The PDA was full throttle -- the couple were smooching and waving like royalty from their water taxi Thursday, with Jeff grinning ear to ear and Lauren beaming just as hard ... looking surprisingly comfortable for someone dripping in extreme, skintight couture

Lauren was serving bombshell -- rocking a sculpted off-the-shoulder midi with a metallic bodysuit that snatched her waist to perfection. If there was a pre-wedding health kick, it definitely did the job!

Jeff Bezos and Lauren Sanchez have a big surprise for their A-list wedding guests -- whisking them away to a top secret location, but before they depart they gotta part ways with their phones ... TMZ has learned.

The wedding festivities are in full swing right now ... with some of the celebs sitting down for a fancy rehearsal dinner ahead. After that, our sources tell us all the guests are heading to a mystery island near Venice -- but, no one's been told where the fun's going down.

We're told most of the Bezos-Sanchez partygoers spent most of Thursday lounging by the pool of the swanky Hotel Cipriani, and some others chilled at fabulous restaurants around the Floating City.