Please Welcome to the Stage: Every Single Surprise Taylor Swift Guest

Who?! Karlie is a Victoria's Secret model who officially became an Angel in 2013. She's appeared in countless editorials, runway shows, and ad campaigns.

Where?! In London, with a veritable avalanche of other fierce women.

Why?! Taylor and Karlie are best friends. They conquered Big Sur together, landed a stunning Vogue cover, and even competed to see who's a better friend.