Shawn Mendes and Camila Cabello have been performing their killer duet "I Know What You Did Last Summer" since it released late last year and the performances are continuing into 2016! 

What Is Shawn Mendes' 'Favorite Picture Of All Time' On His Instagram?

The pair brought their talents to The Tonight Show Starring Jimmy Fallon Monday night for yet another spectacular performance that can be watched below.


That isn't what made this appearance so entertaining, though. It turns out Cabello's mom, Sinuhe, had quite the reaction to meeting Fallon ahead of the performance.

Camila Cabello Dishes Shawn Mendes 'Knows What It Means To Be A Friend'

Cabello definitely was stoked to meet Fallon and got giddy in a video, but her mom might have been a tad more excited.

Cabello doesn't have video footage, but she enlightened fans what happened when her mom saw Fallon nearby.

"My mom saw Jimmy in the hallway and screamed 'OH MY GOD DAS JEEEEEMYYYYYYY,'" Cabello revealed, adding, "Being terrible at playing it cool runs in the fam."

The 18-year-old's mom's reaction appears to have created a bit of back and forth on Twitter between Fallon and the 5H member.

He told her she "killed" the performance and signed the tweet, "Love, Jeeeeeemy."

Cabello responded with love.

How funny, right?

Tags: shawn mendes camila cabello