He decided to go vegan in a bid to ditch the pounds as he approaches his 60th birthday in a few months' time.
Slimline Simon Cowell has rolled back the years to make sure he'll be looking trim and back to his best for his big bash as filming for Britain's Got Talent: The Champions got underway.
The show will see former winners, finalists and viewers' favourites compete for the BGT Champion of Champions title - and there will be a blast from the past in the judges' chairs, too.
Simon, who used to average 11.5st ten years ago, flaunted his weight loss after already shifting 1.5st since ditching dairy and meat.
He revealed that his decision was down to a scare which saw him hospitalised in 2017 due to low blood pressure .
Simon recently told Extra : “I went to see this guy who’s very well-known.
"He said to me, after doing some blood work, ‘You can’t have red meat, dairy, sugar, bread or gluten.’”
Then he told The Sun: "Within 24 hours I changed my diet and I’ve not looked back since. You feel better, you look better.
“It was way easier than you may think. Like, I used to have yoghurt in the morning and I changed it to almond-milk yoghurts. I have almond milk in my tea.
“I can eat certain fruits but not all fruits. You have to be careful because some fruit can have more sugar than a can of Coke.
"Once you get into a pattern I’ve found it quite enjoyable. It has helped me sleep and I wake up feeling less tired. I noticed a massive difference in how I felt in about a week.
“I have more energy and focus and it wasn’t difficult. I don’t like to use the word diet because that’s the reason I never went on a diet before — the word diet makes me miserable.”
Simon was notably slimmer as BGT filming started - but the same couldn't be said of Alesha Dixon !
She announced her pregnancy in May during the first live BGT semi-final show.
The star is expecting her second child with husband Azuka Onoye, a former backing dancer and looked fantastic.
The couple are already parents to daughter Azura Sienna, who was born in October 2013.
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