Taylor Swift, Ellie Goulding 'Red' Tour Surprise Performance [VIDEO]: Harry Styles' Ex Sings 'Anything Could Happen' Duet w/ Niall Horan's Rumored Girlfriend

Taylor Swift loves to bring out special guest performers on during her concerts. Earlier this week, she had Canadian sister singers Tegan and Sara come out and perform their hit "Closer" to an excited crowd. Her latest special guest was British singer Ellie Goulding, who came out and performed her song "Anything Could Happen" with Taylor. What's interesting is that Goulding is currently in the headlines for secretly dating One Direction singer Niall Horan. Swift used to date Horan's band mate Harry Styles, so do you think Ellie and Taylor had a long talk about 1D?

"We have an incredible, insanely talented, incredibly cool artist about to come out on stage to sing for you," Taylor teased her fans. "She's not from around here. She's actually from the U.K."

Then Ellie came up from underneath the stage to sing her Billboard Top 100 song "Anything Could Happen" with Swift.

Check out the video of Ellie and Taylor singing "Anything Could Happen" followed by some Instagram and Twitter posts from the lovely songstresses:

So.. Anything could happen at one of our LA shows. @elliegoulding showed up to sing 'anything could happen'! 15,000 person dance party.

— Taylor Swift (@taylorswift13) August 24, 2013

So.much.fun. Love that girl https://t.co/AzmX6SsQeb — Ellie Goulding (@elliegoulding) August 24, 2013

Beauty contest https://t.co/Z4IIx51bTe

— Ellie Goulding (@elliegoulding) August 24, 2013

Still blown away by how incredible the @taylorswift13 show is and how lucky I feel to have been a part of that last night — Ellie Goulding (@elliegoulding) August 24, 2013