Camila Cabello says she and her boyfriend Shawn Mendes will walk on stage in just their underwear if they win a Grammy Award this Sunday night (26.01.20)

Speaking with Radio.com, Camila, 22, said: "If Shawn and I win the Grammy, we will walk on stage in our underwear like Twenty One Pilots did. That's a promise!"

However, seconds later Camila backed out of her plan insisting she was "just kidding".

She laughed: "I gotta work out before I do that!"

Twenty One Pilots members Josh Dun and Tyler Joseph strolled on stage at the 59th Grammy Awards in 2017 without their trousers to accept the prize for Best Pop Duo/Group Performance for their hit 'Stressed Out'.

They decided to strip down after watching the ceremony one night before they became famous musicians In his speech, Joseph explained: "This story it starts in Columbus, Ohio. It was a few years ago. It was before Josh and I could make money playing music. As we were watching, we noticed every single one of us was in our underwear. We said, 'If we ever win a Grammy, we should receive it just like this!' "

Former Fifth Harmony star Camila, 22, and 21-year-old Shawn - who have been dating since July - are also set to perform their hit song at the glitzy event.