Katy Perry appeared to go completely ɴuᴅᴇ underneath a geometric cut-out dress as she walked the star-studded runway at Vogue World Paris on Sunday evening.

The singer, 39, made a surprise appearance on the catwalk in the barely-there ensemble and joined a host of celebrities.

She flashed her cleavage in the racy look and covered the rest of her modesty with floral motifs.

The beauty opted for a dramatic makeup look, a swipe of bold pink blusher and lipstick.

Katy strutted around the famed Place Vendôme in front of star-studded guests, wearing towering tie-up heeled boots.

A cohort of famous faces are taking part in the sold-out Vogue World event, celebrating 100 years of fashion and sport in the iconic city.

Guests include Gigi Hadid, Ciara, Maluma, Sabrina Carpenter, Emma Chamberlain, Kendall Jenner, Serena and Venus Williams, Bad Bunny, and Aya Nakumura.

Last year the event was hosted in London, while the year before the Big Apple was the backdrop for the high fashion extravaganza.

Those who were unable to get a ticket for the event will be able to watch the action unfold on a live stream, which will be hosted by Cara Delevingne.

This year’s Vogue World collaborated with youth athletic academies across France, pairing different sports with a history of 100 years of French fashion.

The sports include cycling, gymnastics, tennis, fencing, and break dancing, among others and the fashion will shine a spotlight on both modern and historic designers.

Artists who are expected to perform during the show include Bad Bunny and Aya Nakamura, although little detail has been revealed so far.