These Stars Switched Up Their Looks Big Time For Katy Perry's Afterparty

Wearing Ulyana Sergeenko.

Wearing a black slitted dress with thigh-high leather boots.

Wearing a lacy see-through minidress, Maxior earrings, and Stuart Weitzman heels.

Wearing Miu Miu.

Wearing an Emilio Pucci dress with Ara Vartanian jewels, an Edie Parker clutch, and Giuseppe Zanotti platforms.

Wearing a black bustier, high-waisted pants, and furry coat.

Wearing a Valentino look with Jimmy Choo heels.

Wearing Dolce & Gabanna.

Wearing a cropped version of her original Ralph Lauren gown.

Wearing Prada.

Wearing Alexander Wang.

Wearing a yellow PVC jacket and strappy leather miniskirt, accessorized with a Louis Vuitton bag.

Wearing a monochrome look with red sandals.

Wearing a cutout one-shoulder body-con dress with a Lee Savage clutch and Giuseppe Zanotti heels.

Wearing a Rasario dress with Giuseppe Zanotti booties.

Wearing an Off-White tee with her Balenciaga boots.

Wearing a Nicolas Jebran mini with a Giuseppe Zanotti clutch.

Wearing a black crystalized dress.

Wearing an embellished bomber and jeans.

Wearing a leather dress and white blazer.

Wearing a red cutout dress and satin knee-high boots.

Wearing Prada.

Wearing a red fringe dress with an Edie Parker clutch.

Wearing a Tadashi Shoji jumpsuit with Giuseppe Zanotti shoes and an Ethan K purse.

Wearing a black cutout midi dress.

Wearing a jacquard skirt and blouse.

Wearing a baby pink strapless dress.

Wearing an oversize tuxedo coat and shirt with trousers.

Wearing ripped jeans and a quilted bomber.

Wearing a belted satin blazer and pumps.

Wearing a Burberry cape and combat boots.

Wearing a printed dress with flatform sandals.