Karl Stefanovic sings 'Let It Go' at the Royal Melbourne Show

Karl Stefanovic has channelled his inner pop diva, singing “Let It Go” from the hit Disney movie Frozen.

A group of young girls challenged Karl to the sing-off at the Royal Melbourne Show.

Karl put so much passion into his rendition Lisa had to ask if he was alright.

“You look like you’re in pain there Karl, are you okay? Did you burst something?” she said.