John McCririck is known for his distinctive style and of course presenting Channel 4 racing.
But fans were left gobsmacked when he received a makeover - or make-under as some would call it - as part of Channel 5's 100% Hotter.
The horse-racing pundit told the team that he wanted a "new look, something practical and convenient".
Once the crew had worked their magic, John had ditched his trademark Fez for a charming white boater.
He was dressed in white from head-to-toe, which viewers said he looked more like a Backstreet Boy afterwards.
It gets worse...
He then took his hat off and you he was sporting a man-bun!
Yep, you read that right!
I wouldn't say I love it, but its different.
Speaking to the hosts after seeing his new look, John said: "It's definitely different. I wouldn't say I love it, but its different.
"You did the best you could - for all your training I bet you never thought you'd have a patient like me. I like the material, but I need bigger pockets."
Daniel Palmer, the image consultant, then said: "I was very restricted with what I could do with your hair, no scissors, no cutting, no touching.”
He added: “I tried to give you a nice Easy London hipster look, sleek… a little bun at the back.
“I feel like we’ve achieved a lot. I wanted to cut everything off.”
However, those watching at home were not keen, claiming he looked like a wannabe gangster.
One wrote on Twitter: " So they’ve dressed him like P Diddy, plaited his sidies, and scrawled on some fake orange brows… looks like a bad waxwork.”
Others were more focused on John's slimmed-down figure, writing: "Big Mac needs to tell us how he's lost so much weight."