Cutest noncouple ever, Fifth Harmony's Camila Cabello and Shawn Mendes [1] performed their supercatchy duet "I Know What You Did Last Summer" on The Ellen DeGeneres Show on Feb. 16, and they totally owned the stage.

Wearing a tuxedo-style romper, black tie, and some seriously high heels, Camila showed off her adorable dance moves as she sang alongside Shawn cooly strumming his guitar. It's impossible to deny their onstage chemistry, which probably explains the constant dating rumors [2] surrounding these two.

But stepping away from Fifth Harmony hasn't been easy for Camila. The singer, who is totally committed to 5H, received a lot of backlash from Harmonizers when this song was released, and she recently opened up to Seventeen [3] about it all, saying:

"It's been so difficult to watch people criticize me and my intentions. It's been sh*tty. They turned me [doing the song] into a conspiracy theory. We literally just wrote a song backstage, and it ended up becoming something awesome. It wasn't a career move that I carefully planned out."

Haters aside, this performance just proves how talented Camila is. Watch the video above to see for yourself.