Camila Cabello is REALLY Excited About 'Fallon Tonight' With Shawn Mendes

We can’t wait to see Camila Cabello and Shawn Mendes perform on The Tonight Show Starring Jimmy Fallon!

The 18-year-old Fifth Harmony member and 17-year-old “Stitches: singer will be performing their hit duet “I Know What You Did Last Summer,” so be sure to check back to JJJ for all the pics and video.

PHOTOS: Check out the latest pics of Camila Cabello

Meanwhile, Camila can’t hold in her excitement. She posted a cute video on Instagram, which you can see below!

“omg @shawnmendes. @jimmyfallon,” Camila captioned the video.