LISTEN: Camila Cabello & Shawn Mendes Preview Their Top Secret Duet

LISTEN: Camila Cabello & Shawn Mendes Preview Their Top Secret Duet
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Camila Cabello and Shawn Mendes have been getting busy. 

MORE: Camila Cabello and Shawn Mendes are Reportedly Indeed Dating

The two recorded a duet together called "I Know What You Did Last Summer" and Cabello revealed it was actually written backstage at one of Taylor Swift's 1989 World Tour shows. 

"Have a new single coming next week! Been working on this song for months now and am so excited about it!," Mendes tweeted. "It's a secret song from Handwritten Revisited that I co-wrote with @camilacabello97! #IKWYDLS."

Mendes and Cabello were seen out and about together and rumors that the two were dating started swirling. Looks like they might have been seen together because they were recording a song. 

PLUS: Shawn Mendes Reveals What Exactly is Going on With Camila Cabello

Check out the preview of the song below and make sure to check it out on Nov. 18: