London commuters will soon be able to celebrate the upcoming wedding of Prince William and Kate Middleton every time they travel.

Mayor of London Boris Johnson and Transport for London (TfL) today unveiled the design of the limited edition Royal Wedding Oyster card.

The design features a portrait of the couple and the wedding date of April 29 2011 and will be on sale in the week leading up to the ceremony.

Mayor of London, Boris Johnson, said: "Just as Royal Wedding fever starts to take hold in the city, this fantastic commemorative Oyster card is a great chance for Londoners and visitors to have a slice of the action as a fabulous memento of the happy day.

"I would also recommend the card to the happy couple as the cheapest, easiest way of getting around this city, especially as it bears their resemblance."

Around 750,000 of the cards will be available from all London Underground and London Overground stations and some National Rail ticket offices, as well as TfL Travel Information Centres.

More than 80 per cent of all public transport journeys in London are made using an Oyster card and it is the world’s most popular travel smartcard, with more than 43 million cards issued since 2003.

The limited edition Oyster card commemorating Prince William and Catherine Middleton’s marriage follows tradition as, in 1981, a unique ticket was also produced by TfL’s predecessor London Transport for the marriage of William’s parents, Charles and Diana.

Peter Hendy, London’s Transport Commissioner, said: "London’s transport network will play a key role in helping people travel to the wedding celebrations, so it is appropriate that we commemorate the day with a limited edition Oyster card.

"This is the first time we have produced a limited edition Oyster card and I’m sure they will be a hugely popular souvenir of the day while ensuring Londoners and visitors get the cheapest fares for their journeys." The £5 deposit and £5 minimum top-up will apply as normal for the limited edition card and it will be available from April 21.