The family arrived in Venice on Thursday, June 26, ahead of the star-studded nuptials of the Amazon founder, 61, and the journalist, 55, this week. Later that day, the trio was spotted leaving the Aman Hotel en route to the couple's glamorous welcome party at the Madonna dell'Orto church.
Kim, 44, opted for a floor-length snake print dress that hugged her curves. The SKIMS founder wore her hair in long, voluminous waves. Khloé, 40, also went for a printed dress and tousled hairstyle, adding dark sunglasses and a glittering cuff bracelet.
Jenner, 69, appeared in a black dress with a v-neckline, puffed sleeves and 3D rose accents. The momager wore her short hair in a flippy bob and sported a smoky makeup look -- showing off the results of her recent facelift.
Jenner first unveiled her new look when stepping out in Paris for Sánchez's bachelorette party. PEOPLE confirmed that the mogul underwent aesthetic enhancements from plastic surgeon Dr. Steven Levine in New York City, as first reported by Page Six.
The trio was previously photographed walking on a gangway in a series of stylish outfits, with Kim and Jenner opting for all-black outfits, while Khloé, who turns 41 tomorrow, stood out in a leopard print catsuit and black heels.
Kim teamed her black Balenciaga skirt with a bandeau top, snake print heeled boots and gray sunglasses. Jenner chose a ruffled black dress with long sleeves and a cross necklace.
Jenner's boyfriend, Corey Gamble, was pictured arriving in Venice on Wednesday, June 25, with the 44-year-old flashing a peace sign to onlookers as he boarded a water taxi.
The family are close friends of Sánchez, and both Kim and Jenner were among those in attendance at her bachelorette party on May 15 at Lafayette's in Paris.
Several other celebrity guests, including Ivanka Trump, her husband Jared Kushner and Diane von Furstenberg, have also arrived in Venice for Bezos and Sánchez's nuptials, which is being planned by event planners Lanza & Baucina Limited.
Bezos and Sánchez themselves were pictured stepping off a boat together in Venice and arriving at the Aman Hotel on June 25.
PEOPLE confirmed that the billionaire Amazon founder and his fiancée had touched down in the Italian city via helicopter earlier that day.
A source tells PEOPLE the couple has made some last-minute changes ahead of their wedding, in light of ongoing protests that have cropped up across Venice, with posters, stickers and signs around the canal city's historic center reading "No Space for Bezos."
The source adds that the wedding party originally planned on June 28 at Scuola Grande della Misericordia, a medieval former religious school in Cannaregio, has now been moved to a new location due to protests and safety concerns.
The expected 200+ guests -- many of whom are A-list celebrities -- will instead celebrate in a hall at the Arsenale, a large 14th-century complex in the eastern Castello district, which is surrounded by water and unreachable by land when connecting bridges are raised.