Say cheese, Sanchez.

Billionaire Jeff Bezos acted as his new fiancée Lauren Sanchez’s personal photographer aboard his $500 million Koru superyacht Monday in Portofino, Italy.

In pictures obtained by The Post, Sanchez, 53, posed at the ship’s mast in a black thong bikini while the Amazon CEO, 59, snapped the shots wearing a black T-shirt and orange swim shorts.

Before the photo shoot, the couple landed on Koru’s $75 million support vessel in a helicopter.

They then took a speedboat to the massive yacht.

Former news anchor Sanchez donned a tight black dress, black wedges and what appeared to be a red Hermes bag for her arrival.

Meanwhile, the world’s third-richest man kept it casual in a pair of jeans before gearing up for the water.

The pair were also spotted talking and lovingly hugging during the voyage.

They also ate lunch on the ship’s deck with who appeared to be Sanchez’s three kids: Nikko Gonzalez, her child with NFL player Tony Gonzalez, and Evan and Ella Whitesell, with ex-husband Patrick Whitesell.

Bezos and his first wife, MacKenzie Scott, have four children together: Preston, as well as two more sons whose names and ages are unknown, and a daughter they adopted from China.

Bezos and Sanchez got engaged late last month before jetting off to the Cannes Film Festival.

They celebrated the next installment of their love connection by ordering a $4,285 bottle of Dugat-Py Grand Cru wine from Domaine Bernard at La Petit Maison in Cannes.