'Saturday Night Live' double duty: Justin Bieber to the Rolling Stones

'Saturday Night Live' double duty: Justin Bieber to the Rolling Stones: Nov. 7, 2009

Swift is the third-youngest person (behind Bieber and Britney Spears) to pull double duty on SNL.

(NBC)

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Taylor Swift

Nov. 7, 2009

Swift is the third-youngest person (behind Bieber and Britney Spears) to pull double duty on "SNL."

Feb. 6, 2013