The BGT honcho arrived at the Hammersmith Apollo in serious style, stepping out of a black Rolls Royce that had been driven by fellow judge Dave.
Dressed for the role, David was wearing a traditional driving outfit, consisting of a white shirt, dark grey suit, black tie and chauffeur hat.
We're disappointed to see that he hadn't pulled out all the stops however - where are the gloves?!
Simon, who is expecting his first baby with girlfriend Lauren Silverman, meanwhile came dressed in his trademark outfit of flared jeans, loafers and white T-shirt.
The star did mix things up though with a long wool coat and scarf. How very daring!
As Simon made his way towards the red carpet to greet waiting press, David continued with his act and even gave an honorary salute.
It was good to see Simon back in action, as last week he was force to miss the Manchester BGT auditions due to illness.
Meanwhile, Amanada Holden braved the cold today in a Victoria Beckham dress while Alesha Dixon opted for something a little warmer.
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