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Camila Cabello and Shawn Mendes Break Down How They Wrote ‘I Know What They Did Last Summer’

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Camila Cabello and Shawn Mendes came together last night to perform their smash hit, ‘I Know What You Did Last Summer’, on the Tonight Show with Jimmy Fallon. Before the show, the two sat down and talked about how they actually wrote the song backstage at a Taylor Swift show! Check it out!

 

 

 

Photo by: Douglas Gorenstein/NBC