Prince William and Kate Middleton Get Stamp of Approval

March 29, 2011— -- England's Royal Mail will release stamps of the royal couple on April 21, which also happens to be the queen's birthday.

The prince is accustomed to having his face adorn envelopes, as he has been on British stamps twice before. The first celebrated the queen mother's 100th birthday in August 2000. Another feted his 21st birthday in 2003.

These stamps replicate the now famous portraits taken by photographer Mario Testino, couple's reserved engagement photo taken in the Royal Council Chamber and the second less formal shot snapped in the Palace's Cornwall Room.

These special stamps can be preordered online starting April 7, giving the British public yet another way to commemorate the hallmark wedding.