Simon Cowell and girlfriend Lauren Silverman show off their tans after trip to ...

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Simon Cowell and girlfriend Lauren Silverman stepped out in on Monday evening to attend a party for his series America's Got Talent.

The pair complemented each other in white and dark combos, Simon in a crisp shirt and navy slacks, Lauren in a pearl blouse and black sparkling trousers.

The couple showed off their tans - having spent some time in Cabo, Mexico, over the last few days.

Date night: Simon Cowell and girlfriend Lauren Silverman stepped out in Hollywood on Monday evening to attend a party for his series America's Got Talent

Date night: Simon Cowell and girlfriend Lauren Silverman stepped out in on Monday evening to attend a party for his series America's Got Talent

Simon, 59, continued to show off his 20lbs weight loss, dragging on a cigarette as he posed alongside his other half.

Lauren, 42, looked pretty, wearing her raven tresses loosely around her shoulders and wearing a light touch of make-up to highlight her own tan.

Lauren recently praised Simon's new look - which he has achieved since going on a strict vegan diet.

Speaking to Extra, Lauren said: 'He's so thin, he looks so awesome.'

On his diet, Simon has cut out dairy, sugar, bread, gluten, and meat and won't even let the regime slack on his 60th birthday next week.

He vowed: 'No cakes. There will not be a birthday cake.'

Full of beans: The pair complemented each other in white and dark combos, Simon in a crisp shirt and navy slacks, Lauren in a pearl blouse and black sparkling trousers

Full of beans: The pair complemented each other in white and dark combos, Simon in a crisp shirt and navy slacks, Lauren in a pearl blouse and black sparkling trousers

Out on the town: The couple showed off their tans - having spent some time in Cabo, Mexico, over the last few days

Out on the town: The couple showed off their tans - having spent some time in Cabo, Mexico, over the last few days

The Britain's Got Talent judge recently admitted during an appearance on The Show that he drastically changed his diet so he could keep up with his son Eric, five.

He said: 'I went to see this doctor in London. We did some tests. And then a month later he said, "You have the worst diet I've ever met from any patient." 

'So I went, "Okay, out

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