Lauren Sanchez is tacking “Bezos” onto her last name … sharing a pic of herself in a gorgeous white wedding dress and changing her name on IG.

The star — who held a wedding ceremony to Amazon founder Jeff Bezos on Friday in Venice, Italy — shared the first look at the gown on her IG … and changed her screenname to “Lauren Sanchez Bezos.”

She also wiped her IG clean … a fresh slate for the newlywed as she heads off into married life.

Vogue shared more pics of her wedding dress … revealing it’s a Dolce & Gabbana gown — which we knew it would be after seeing pics of them outside a storefront for the big-time brand in Milan — with a high-necked, hand-appliquéd Italian lace.

Lauren also told the outlet this is the first time she’s ever worn a formal dress that covered her chest. She calls it a “departure from what people expect, from what I expect — but it’s very much me.”

She stripped down in another shot from Vogue … where she wore a tuxedo shirt like Jeff planned to for the ceremony — teasing a hint of her cleavage in the sexy ensemble.

Sanchez also has more outfits coming this evening, BTW … so stay tuned as more pics of these outfits come in.

The couple’s wedding might be the big event … but, there’s still more on the way from their wedding week — including parties all weekend before A-listers are expected to head home Sunday. Among those events is Friday’s reception and a pajama party on Saturday.

A-listers have been flowing into the city all week … from the Kardashian clan and Tom Brady to newly-single Orlando Bloom — and ready to mingle Brooks Nader.

Like we told you … bonds are being formed among the guys like Bloom, Brady and Leonardo DiCaprio at the party central of the event, The Gritti Palace. And, Sydney Sweeney is looking “f***ing beautiful” according to one source — and capturing everyone’s attention, including TB12.