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Watch: Taylor Swift and Charli XCX performing 'Boom Clap' together live.

Watch: Taylor Swift and Charli XCX performing 'Boom Clap' together live.

Last night in Toronto, fans attending the 1989 World Tour were treated to Taylor Swift and Charli XCX performing 'Boom Clap' together live as a duet.

Watch the performance below...

P.S. Click here to read our latest interview with Charli.

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