Taylor Swift is still on her gigantic arena tour in support of her latest album, "Red," and she has been known to bring out some special guest performers for her concerts. She recently brought out Carly Simon for a duet of "You're So Vain," and also had rapper T.I. and Jim Adkins (Jimmy Eat World) surprise fans in the past. This time around, Taylor brought out the sister duo Tegan and Sara for a special performance of their new song "Closer." Swift was having a ball during the performance and the Canadian sisters have expressed their gratitude for Taylor on Twitter.

Check out this fan footage of the special collaboration right here:

Here are some Twitter reactions (including some from Taylor, Tegan, and Sara) to the "Closer" performance:

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