Echosmith and Taylor Swift performing 'Cool Kids' together live.

Echosmith and Taylor Swift performing 'Cool Kids' together live.

June 15, 2015 | by Shahlin Graves

Echosmith joined Taylor Swift on-stage during her 1989 Tour show in Philadelphia this past weekend, as her special-guest to perform 'Cool Kids' together live.

Watch the performance below...

P.S. Click HERE to read our latest interview with Echosmith.

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