Video: Taylor Swift at Haim's London concert for "Love story" 

The famous singer Taylor Swift surprised her fans by joining her pals Haim at a London concert.

It was really surprising for Taylor's fans because the didn't expect that they may hear Taylor at that concert.

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She performed at Haim's concert on a mashup of "Love Stor" and Gasoline.."

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She had made a remix of Women in Music Pt. III track “Gasoline” with Haim last year.

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But since than she didn't performed live before this concert.

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Taylor and Haim the both were in matching black leather pants with black crop and bra tops for the blazing hot night.

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Her with sister trio performing was as similar as the opening act of Swift’s 2015 1989 tour

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You may watch here the moment when she performed the mashup of "Love Story" and "Gasoline"

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