Video: Taylor Swift Learns the Secret of Carly Simon's 'You're So Vain' ... but Is She Telling? MTV

Taylor Swift joined forces with a singer-songwriter from a few decades ago who was one of her inspirations, Carly Simon, with the two women performing Simon's signature song, "You're So Vain." In the process, Swift learned the answer to one of the great secrets of popular music: Who was the song written about?

Here's the video, which was posted by MTV:

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