Monica Schipper/Getty Images
Briana Draguca
Jan 23, 2016 @ 3:00 pm

Shawn Mendes and Fifth Harmony’s Camila Cabello are the hottest duo to hit pop music in recent memory. In November, the pair released their chart-topping single, “I Know What You Did Last Summer,” a duet that they wrote last summer while backstage at one of Taylor Swift's 1989 World Tour concerts. (Mendes was performing as one of the tour's opening acts.)

These days, 17-year-old Mendes and 18-year-old Cabello have taken their joint talents from the tour bus to the stage. An their performance chemistry is still on fire: see their recent appearances at the People’s Choice Awards, Pitbull’s New Year’s Revolution, and The Tonight Show Starring Jimmy Fallon. So it comes as no surprise that the social media superstars' collaborative efforts have garnered attention. Together, their Instagram fanbase totals more than 11 million followers—and that’s where they’re sharing the music videos that really keep us interested. Scroll down to see four of Mendes and Cabello's best impromptu jam sessions.

1. The duo gave us chills with their acoustic mash-up of Ed Sheeran's "Give Me Love" and Beyoncé's "Say My Name."

Say my name x give me love @camila_cabello

A video posted by Shawn Mendes (@shawnmendes) on

2. Cabello gave us an inside look at how she and Mendes first came up with “I Know What You Did Last Summer,” and it’s clear that the chemistry has been there all along.

RELATED: 9 Reasons Shawn Mendes is the Most Adorable Rising Star

3. The singers mixed catchy chords while goofing around at another one of their music-making sessions.

Shes stoked because i didn't know the chords and she did hahaha

A video posted by Shawn Mendes (@shawnmendes) on

4. Mendes and Cabello teamed up with another famous friend, Charlie Puth, for a harmonized rendition of Justin Bieber’s “Sorry.”

Charlie is a computer.. This is rlly cool haha @camila_cabello @charlieputh

A video posted by Shawn Mendes (@shawnmendes) on

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