Britain’s Royal Mail has announced the release of a set of stamps commemorating the upcoming Royal Wedding of Prince William and Catherine Middleton.

The stamps to mark the engagement and next month’s royal wedding will feature two official portraits taken by renowned Peruvian fashion photographer Mario Testino.

The photos were taken on November 25, and showcase formal and informal poses. The formal image was taken in the Council Chamber of St. James’s Palace, while the informal image captures the couple in the Palace’s Cornwall room.

The stamps, approved by Queen Elizabeth II, will be released on her birthday, April 21.

“We are honoured to be celebrating this very special and historic occasion. We believe that this set of stamps will be very popular with people both in the UK and around the world,” Royal Mail’s Stephen Agar said in a press release.

This will also mark the third time Prince William has graced a Royal Mail stamp. His first was to celebrate Queen Elizabeth, the Queen’s Mother’s 100th birthday, and again to celebrate his 21st birthday.

Prince William is also the first grandchild of the Queen’s to have their wedding commemorated in this way.

The stamp sheet consists of two first class stamps and two more £1.10 stamps.

The Royal Mail’s Special Stamp program has been in place for almost 50 years to commemorate and celebrate events and anniversaries pertinent to UK heritage.

The stamps can be viewed and pre-ordered at the Royal Mail website: