Mask-arade: Prince William and Kate, Duchess of Cambridge

Pam Cooper from the Mask-arade mask company loads boxes of Prince William and Kate, Duchess of Cambridge masks ready for dispatch at the company works in Southam, England. (AP)

Workers from the Mask-arade mask company sort Kate, Duchess of Cambridge masks ready for dispatch at the company works in Southam. (AP)

Mask-arade are in overdrive printing masks of Kate and William for the street parties that will follow the announcement of the birth of the Royal baby, expected in July. (AP)

Pam Cooper from the Mask-arade mask company loads boxes of Prince William and Kate, Duchess of Cambridge masks ready for dispatch at the company works in Southam. (AP)

Britain's Prince William and Catherine, Duchess of Cambridge arrive with Prince Harry (R) at Westminster Abbey to celebrate the 60th anniversary of Queen Elizabeth's coronation in London June 4, 2013. Britain's Queen Elizabeth II returns to the scene of her coronation on Tuesday to mark a reign that has weathered six decades of social transformation and the end of her country's global empire. (REUTERS)

Britain's Prince William (L) and Catherine, Duchess of Cambridge arrive at Westminster Abbey to celebrate the 60th anniversary of Queen Elizabeth's coronation in London June 4, 2013. Britain's Queen Elizabeth II returns to the scene of her coronation on Tuesday to mark a reign that has weathered six decades of social transformation and the end of her country's global empire.  (REUTERS)

Catherine, Duchess of Cambridge attends a Garden Party in the grounds of Buckingham Palace hosted by Queen Elizabeth II. (Photo by Getty Images)

Catherine, The Duchess Of Cambridge (Photo by Getty Images)

Kate the Duchess of Cambridge looks at the costume for the character Hagrid in the Harry Potter films. (AP)

Catherine, Duchess of Cambridge arrives to attend an evening reception to celebrate the work of The Art Room charity at The National Portrait Gallery in London. (AFP)

Catherine, Duchess of Cambridge waves as she arrives on her visit to The Willows Primary School. (AFP)

Catherine, Duchess of Cambridge, showing visible signs of pregnancy, attends the National Review of Queen's Scouts at Windsor Castle in Berkshire. (REUTERS)

Catherine, Duchess of Cambridge visits the Great Tower Scout Camp at Newby Bridge in Cumbria. (REUTERS)

Prince William and his wife Catherine, Duchess of Cambridge visit the offices of Child Bereavement UK in Saunderton, southern England. (REUTERS)

Catherine, Duchess of Cambridge smiles during a visit with her husband, Prince William (3rd L), to attend a St Patrick's Day Parade at Mons Barracks in Aldershot, southern England. (REUTERS)

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