Prince George Poses With Queen Elizabeth, Prince Charles & Prince William For a Special Portrait

Just when you thought Prince George couldn't get any cuter, a new image released in honor of Queen Elizabeth II's 90th birthday proves that theory wrong. In the photograph, the young royal poses with four generations of the British Royal Family: his father Prince William, grandfather Prince Charles and great-grandmother ("Gan-Gan") Queen Elizabeth. Clasping his father's hand and beaming, Prince George stands atop a pile of foam blocks to reach the height of his seated family. The photograph has been released as a stamp to commemorate the Queen's birthday, which falls on April 21.