Simon Cowell couldn't stop smiling as he ditched his healthy diet to sneak a cheeky beer and a cigarette on a night out in London.

The X Factor boss, 60, has lost an incredible 1.5 stone by becoming a vegan and embracing a new exercise regime.

However, he couldn't hide his delight as he clenched a cigarette between his teeth and clutched a bottle of beer after a night out with partner Lauren Silverman.

Simon flashed a huge grin in the car and continued puffing away in the back of his luxury ride.

The couple had been attending the Shooting Star Ball in West London, and it looks like they had a fun evening.

After deciding to overhaul his lifestyle, Simon was advised to give up booze along with sweet treats and bread.

In an interview with Extra, he explained: "I went to see this guy who’s very well-known.

"And he said to me, after doing some blood work, 'You can’t have red meat, dairy, sugar, bread or gluten.'

"I’m thinking, 'What about alcohol?' And he said, 'Maybe not quite as much as you had before.' And I did it and I stuck to it and it’s easy."

However, he hasn't given p booze completely as his Britain's Got Talen co-star Amanda Holden revealed Simon had switched to low alcohol "skinny lager".

During an appearance on Good Morning Britain, she said: "He’s drinking lightweight beers, that’s the secret.

"And I tasted it because I thought it was gonna taste, like, naff. Actually it’s quite decent. You could take a tip from him!"

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