EXCLUSIVE PICS: Inside the 2017 Met Gala -- Katy Perry Performs, Kendall Jenner Flaunts Her Booty & More!

Get the never-before-seen shots from fashion's biggest night!

Didn’t score a ticket to fashion’s hottest night? Not to worry! Only ET has the exclusive behind-the-scenes images of your favorite stars at the 2017 Met Gala.

The celeb-packed event took place on Monday at the Metropolitan Museum of Art in New York City, with the theme “Rei Kawakubo/Comme des Garcons: Art of the In-Between,” and the stars certainly didn’t disappoint.

RELATED: EXCLUSIVE PICS: Inside the 2017 Met Gala

Once inside the iconic building, the A-list guests were treated to a performance from both Katy Perry and Migos while admiring the new exhibit.

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Longtime pals Jaden Smith and Kendall and Kylie Jenner were spotted walking around the museum, admiring the show. Earlier in the evening, Smith posed on the carpet holding his own blonde dreads, while Kendall and Kylie each stunned in their revealing gowns -- seriously, no one could get enough of Kendall flaunting her booty.

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And the young Hollywood trio weren’t the only friends catching up. Blake Lively and Ryan Reynolds posed with Reynolds’ Life co-star Jake Gyllenhaal and actor Hugh Jackman for a dapper shot at dinner. Is it just us or is Wolverine giving Deadpool some sneaky side eye?

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One couple that only had eyes for each other was Joe Jonas and Sophie Turner. Though the pair opted to walk the red carpet solo, they linked up for the event, strolling arm-in-arm through the museum before busting a move on the dance floor.

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An unexpected duo who also showed off their moves were first-time attendees Celine Dion and Halle Berry. The legendary stars broke it down, letting loose for all to see.

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It could be because they were listening to the vocal stylings of Katy Perry, who changed out of her red avant-garde Maison Margiela Couture gown and into a black latex ensemble for her performance. Perry rocked her new platinum buzz cut as she sang for the celebrity crowd.

MORE: 13 Can't-Miss Looks From the 2017 Met Gala

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And though they didn't party on the dance floor, designers Mary-Kate and Ashley Olsen certainly turned heads when they ditched their signature black for two white ensembles. The Row designers kept their signature straight faces, but did get adventurous with their intricate gowns.

For more from the Met Gala, watch the clip below!