Was Taylor Swift involved in Shawm and Camila's new song?

The M staff is totally obsessed with Shawn Mendes and Camila Cabello's new collab, "I Know What You Did Last Summer"-it's so good! And do you know what makes it even better? Taylor Swift played a small part in it! "Shawn and I wrote the song backstage at one of Taylor's shows on the 1989 tour during a random jam session," Camila shares. Yep, Tay's love of songwriting truly inspired the duo!