Fifth Harmony singer Camila Cabello has told fans that she might just "pee herself" during a TV performance this evening (January 4).

The singer is due to feature alongside Shawn Mendes on Jimmy Fallon's Tonight Show. They will run through their collaborative single 'I Know What You Did Last Summer'.

Speaking on Twitter ahead of the performance, Cabello admitted that she is very excited - or nevous - about the slot.

She wrote on Sunday (January 3): "Gonna pee myself at @FallonTonight tomorrow when @ShawnMendes and i perform I just wanted to warn u all."

Cabello recently said that the duet allowed her to access another side of her musical personality.

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Watch the video for 'I Know What You Did Last Summer' below: