Over the weekend, Swift sang duets with Uzo Aduba and Mary J. Blige during her concert in Los Angeles. The Taylor Swift concert guest stakes must continually be raised until she inevitably brings Obama onstage.  

https://www.youtube.com/watch?v=pRd6mVdaEKw
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It was all you could really ask for in a celeb Taylor Swift guest extravaganza (other than an onstage mediation with Katy Perry).

Orange Is The New Black star Aduba apparently is a classically trained singer, and her version of Swift's "White Horse" (above) made a lot of people cry and/or fall in love depending on which tweets you're reading.

https://twitter.com/taylorswift13/status/635366919793610752?ref_src=twsrc%5Etfw

Mary J. Blige sang two of her own songs, "Family Affair" and "Doubt," with Swift joining in. But obviously when Tay sang "no more drama in my life" she was being sarcastic. 

https://www.youtube.com/watch?v=5BOY-ivA-2c
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Sources: Entertainment Weekly