Kate was joined by her husband Michael Polish as well as designer Tory Burch and actress Zoey Deutch.
The Met Gala is known as "fashion's biggest night out" for a good reason - the mouthwatering roster of celebrities who arrive on the red carpet styled to perfection.
Kate is wearing Tory Burch.
But which star had the most memorable ensemble? And her beauty look was just as epic as her gown, which makes ideal sense given that the singer's own Fenty Makeup line is set to launch this fall, with her hair pulled up into a topknot and a metallic pink eye that extended along her cheekbone.
Several stars were spotted smoking cigarettes in the bathroom during Monday night's Met Gala - which is illegal in New York City.
See all the sexy, odd and most revealing looks from the Met Gala 2017 red carpet.
Russian interference in 2016 election has been 'well documented,' Tillerson says
Tillerson said President Trump believes it is important to "reengage" Russian Federation , acknowledging that the two countries have problems to address.
Oscar-winning actress Brie took to Twitter later that evening to confirm she wasn't supposed to be part of the selfie, she just happened to be in the bathroom at that moment.
She promoted the track with performances at the Grammys and Brit Awards, both of which featured political imagery meant to spark debate. Every year we are treated to a bevy of supercharged pieces, and all eyes are on the celebrities as they sashay in some of the most fabulous Met Gala dresses.
While the festivities surrounding the 2017 Met Gala might have ended, the Metropolitan Museum of Art's latest Costume Insitute exhibition is set to be opened to the public on May 4.
Singer Pharrell Williams in jeans and leather jacket, and star couple Tom Brady and Gisele Bundchen in matching silver helped Vogue editor-in-chief Anna Wintour host the annual fundraiser.
Her sister, Bella, dressed in a sexy sheer catsuit by Alexander Wang.
Never one to shy away from an inventive look, Solange Knowles opted for a high-fashion take on the puffer coat.