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Taylor Swift's Surprise Guest

The singer brought Carly Simon out to join her in singing Simon's 1972 hit "You're So Vain."
00:24 | 07/29/2013

Transcript for Taylor Swift's Surprise Guest

It's just so wonderful like I just want to do it again she was so great she really led me through -- My own songs she was just so loving. Together and apart this dramatic. It was great. Losers have... See More
This transcript has been automatically generated and may not be 100% accurate.
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