Inside Jeff Bezos and Lauren Sánchez’s Final Wedding Party — Including Which Star Was ‘Tearing Up the Dance Floor’ (Exclusive)

Jeff Bezos and Lauren Sánchez Bezos know how to throw an epic party!

After saying their “I dos” in a lavish Venice wedding on Friday, June 27, Bezos, 61, and Sánchez, 55, treated their star-studded guests to a pajama-themed wedding party on Saturday that lasted until the early hours of Sunday, PEOPLE can exclusively reveal. 

“It was great. It went until 4 in the morning [and] started at 7:00 p.m. It was a pajama-themed party with everyone wearing silk and robes and slippers,” a source tells PEOPLE. “It was epic. A full-fledged dance party with everyone standing on the banquettes and all of the sofas and couches.”

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Bride Sánchez attended the wedding party, which was themed “Dolce Notte” (Sweet Night), in a Versace silk chiffon dress with a bodice adorned with Swarovski crystals in rose gold, bronze and gold.

The hand-embroidered design took 350 hours to make.

For the guests, the women were given black Amazon slippers to wear at the party, while the men were gifted with Vibi Venezia velvet slippers, made by Countesses Viola and Vera Arrivabene, daughters of Bianca di Savoia-Aosta and Count Gilberto Arrivabene Visconti Gonzaga.

Guests were treated to performances from Usher and DJ Cassidy, who got everyone from Oprah Winfrey to Leonardo DiCaprio “dancing from start to finish” — with one particular guest stealing the show.

“Best dancer award goes to Jessica Alba, she was tearing up the dance floor,” the same source tells PEOPLE. “Kris Jenner and Cory Gamble were on the dance floor a lot, too. It was an epic night.”

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According to the insider, Bezos and Sánchez didn’t have a first dance at the party, joining the guests instead on the dancefloor and Usher onstage. “No formalities at this one, just partying,” the source adds.

Guests at the party were presented with a buffet of several Italian desserts, including tiramisu, cannolis and chocolate. They also enjoyed a fireworks display over the Venice Laguna at around 10:30 p.m. during the festivities. 

Bezos and Sánchez tied the knot in a black-tie ceremony on the island of San Giorgio Maggiore in Venice, Italy, on Friday, June 27. 

The Amazon founder and the Emmy-winning journalist celebrated their Italian nuptials over three days as several of their celebrity friends joined the festivities in the Floating City, including Bill Gates,Kim Kardashian, Khloé Kardashian,, Kylie Jenner, Mick Jagger, Karlie Kloss, Sydney Sweeney, Tom Brady, Gayle King and Orlando Bloom.