Prince William drove his new wife Kate out of Buckingham Palace in a convertible Aston Martin today - with the number plate "JU5T WED" on the back.
Best man Prince Harry and other family and friends tied balloons to the back of the Prince of Wales's car.
A St James's Palace spokesman said: "It was Prince William's idea to drive his new bride away from the official reception on their first journey as a married couple to his family home."
On the front of the Seychelles blue classic car was a L plate and patriotic red, white and blue ribbons tied from the windscreen to the bonnet.
In tribute to the happy couple, the RAF flew overhead in a yellow rescue Sea King helicopter - as a special surprise for the bride and groom
It was in honour of William's job as a RAF search and rescue helicopter pilot.
He smiled broadly as he drove his wife, still in her bridal gown, through the Privy Purse.
The new Duke of Cambridge had switched from his scarlet wedding ceremony attire.
Well-wishers lining the route reacted to the choice of car with delight and disbelief.
Claire Bull, 52, from Flimwell, East Sussex, said: "It was quite a surprise, I thought it would be another carriage or something.
"They both looked very happy and relaxed."
Tom Fitzpatrick, 67, visiting from North Carolina in the US, said: "I thought they were a handsome couple. They looked fabulous. They're very gregarious, both of them."
Pamela Anderson, 66, from Bridgend, South Wales, said the car was "a real surprise" and was "wonderful".
She said: "I was expecting a Rolls-Royce."
The choice showed they were "at one" with the people and the country had "taken them to their hearts", she added.