It's been a big week for Taylor Swift [1], who made up with Kanye West [2], released a new music video [3], and landed a Vogue cover [4] with her BFF, Karlie Kloss. To accompany their lovey-dovey spread, the singer and model competed against each other in a video for the magazine called "Who's the Best Best Friend?" They were put through a series of tests including talking at the same time, staring into each others' eyes, and arm wrestling — and you might be surprised at who nabs the title. Watch the video above now, and check out more pictures of Taylor and her bevy of celebrity girlfriends here [5].