Monday, June 1, 2015 3:34am ET by  
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Taylor Swift performs with Imagine Dragons' Dan Reynolds

Taylor Swift has performed a surprise collaboration with Imagine Dragons star Dan Reynolds.

The singer teamed up with Reynolds at her gig in Detroit over the weekend.

They ran through Imagine Dragons' 2012 hit 'Radioactive'.

Reynolds took to the internet post-show to type: "Thanks for having me @taylorswift13 u are a gem of the rarest kind – like found in stalagmites in the earths core next to t rex bones."

Swift replied: "Thank you again @DanReynolds for coming to Detroit. You’re incredible."

The US star was performing in Detroit as part of her 1989 Tour.

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Watch the collaboration below: