Jeremy Corbett unveils jaw-dropping transformation

Jeremy Corbett has undergone a jaw-dropping transformation - and he's no longer a silver fox.

The comedian had the first of five cosmetic treatments on Monday night to usher in Beauty Week on The Project.

After a viewer suggested a hair colour change for the famously grizzled host, he was whisked backstage to the makeup room during the live show.

There, his hair and beard were tinted black with a wash-out dye in a makeover that drew gasps, whistles and even a comparison to Hollywood hunk Jon Hamm from fellow host Kanoa Lloyd.

"I thought you were beautiful the way you were, but I'm actually quite rocked by how hot you look," said stunned guest host Patrick Gower.

Despite all the compliments, Corbett says he won't be keeping his new look for long.

"I embrace the grey, I'm happy with the grey," he said. "There's not as much pressure on men for some reason to go that way."

Watch the full video on The Project.