Here's What Taylor Swift Changed Into After the Met Gala

After the after party is.. Well.. This. @haimtheband

A photo posted by Taylor Swift (@taylorswift) on

Safe to say Taylor Swift had a big night on Monday, May 2.

The "Style" singer cochaired the Metropolitan Museum of Art’s Costume Institute Gala 2016 with Idris Elba, slayed in a silver Louis Vuitton frock with knee-high lace-up heels, and even had a dance-off with Tom Hiddleston at the afterparty.

The star-studded guest list of the Met Ball included Swift's BFFs Selena Gomez, who also wore Louis Vuitton; Lorde in Valentino; Karlie Kloss wearing Brandon Maxwell; and all three of the Haim sisters, who sported coordinating black and white creations from Rodarte.

For Swift, there was only one way to cap it off: comfy and cozy. "After the after party is..Well..This. @haimtheband," she wrote on Instagram the next day, alongside a picture that shows exactly what each girl swapped her designer duds for.

In the funny snap, Swift rocks a unicorn-themed onesie that matches the "The Wire" singers' bunny and Dalmation animal versions. The group also proudly put a full cheese and pepperoni pizza on display.

What do you think of the quartet's post–Met Gala getups?

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