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Several guests at the Lauren Sanchez-Jeff Bezos wedding tell TMZ the wedding was "a blast," and everybody cut loose ... yet none of the big names who are single hooked up.

We're told there was a roar when Jeff and Lauren made their grand wedding entrance.

Enough about the wedding ... the party went until 2 AM and mostly everyone cut loose on the dance floor. We're told Tom Brady "danced with everyone," including Sydney Sweeney and Brooks Nader.

Orlando Bloom also made the rounds, but neither guy honed in on any particular partner.

Brady was "all over the place," at one point taking the reins from Kygo in the DJ booth.

Lauren Sanchez and Jeff Bezos were all smiles as they arrived at the iconic Harry's Bar in Venice on Saturday ... less than 24 hours after tying the knot in front of 200 of their closest family and friends!

Just look at the billionaire lovebirds ... they appear to be in true newlywed bliss as they blow kisses at the crowd and grin from ear to ear.

They swapped their formal wedding attire for something more casual -- the Amazon founder opting for a brown T-shirt and matching trousers and the journalist looking fun and flirty in a black off-the-shoulder dress paired with a sun hat.

Justin and Hailey Bieber are giving off happy couple vibes amid fan concern about their marriage.

The Biebs just posted a bunch of photos from a lakeside getaway he's enjoying with his wife ... and it looks like the pair teamed up for some pickleball.

In one photo on Justin's IG post, Hailey is flashing two pickleball paddles in front of the camera.

Jeff Bezos and Lauren Sanchez are sparing no expense for their wedding guests ... tossing them some great gifts -- which also happen to be a great advertising opportunity for Amazon.

Sanchez spoke to Vogue in an article published after she shared a photo of her wedding dress Friday ... and, she gave an inside look at the goodie bags she and Jeff gave to their guests.

LS told the outlet she and Bezos wanted their guests to feel comfortable while wearing their new gifts ... revealing all the dudes are going home with Vibi Venezia blue velvet Venetian slippers -- and, the women are getting black open-toe slippers from Amazon.

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.

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.

The KarJenner clan might be going to the wedding of the century ... but, they won't be playing second fiddle to the bride and groom -- 'cause they're already stealing a ton of attention with their fashionable looks!

Kim Kardashian led the group out of a swanky Venetian hotel, slithering through the streets in a gorgeous low-cut, snake-print ensemble ... kicking off the festivities for Jeff Bezos and Lauren Sanchez.

KK and her sister Khloé Kardashian -- clad in a tight silver-and-black cocktail dress -- were throwing up peace signs as they floated down the canal in a little boat while a pal took a pic of them.

Brooke Schofield just confirmed all the online rumors ... because she announced on her Instagram today that her Cabo vacay turned out to be an "engagement-moon" with her now-fiancé Miles McFly!!!

The "Cancelled" Podcast cohost -- alongside bestie Tana Mongeau -- is arriving back in the States with a ring on her finger after fans have been speculating for weeks the content creator is secretly engaged.

Earlier this month, Brooke made an oopsie by posting a video accidentally flashing a ring on THAT finger ... but she addressed it with a comment claiming she was "just manifesting" -- so she was either lying, or she needs to give us tips on talking to the universe.

Michelle Obama's sick of divorce rumors about her and Barack ... and, she's got a simple message for their fans -- stop assuming there is a right way to prove you love someone!

The former First Lady sat down for an interview with NPR -- published Thursday -- and, she told everyone she and her husband aren't spring chickens anymore ... so, they don't share everything on Instagram like younger generations might want them to.

Michelle says the lack of social media surplus doesn't mean the two are getting ready to split ... they're just not interested in sharing every little thing with the public.

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.

The stars have begun to arrive in Venice for the ultra-luxe wedding of Jeff Bezos and Lauren Sanchez!

Check out our gallery ... the who's who are traveling to the Floating City in droves to witness the billionaire lovebirds say "I do."

We caught Kim and Khloe Kardashian smiling as they surfaced at Marco Polo Airport ... Kim wearing a two-piece set from Balenciaga and KoKo showing off her assets in a skin-tight cheetah-print mini-dress. Their mother, Kris Jenner, also appeared to be in high spirits as she rocked a flowing, comfy-for-travel gown.