Kate's first interview as a royal will feature in a documentary about the Queen

In celebration of the Queen's 90th birthday, royal fans will be treated to a host of exciting events. From the service of thanksgiving at St. Paul's Cathedral to the Patron's Lunch, a massive street party on The Mall hosting 10,000 guests in June, the festivities will be befitting of the longest-reigning monarch in the U.K. Another milestone will also be welcomed by the masses: glimpses of an interview with Kate.

ITV announced on Monday that the Queen's 90th birthday will be celebrated with a new program on her life and reign in which the Duke and Duchess of Cambridge, neé Kate Middleton, and Prince Charles and the Duchess of Cornwall, will make a special contribution.

Prince William and Kate will feature in the special program, The Queen at Ninety.

The film, to be shown this spring and with the working titled The Queen at Ninety, is two hours long and features interviews from many key figures in Her Majesty's life, including her son Prince Charles, his wife, Camilla, and Prince William and Kate. This will be Kate's first interview as a royal.

The producer of the program, Oxford Film and Television, has been granted close access to the work of Her Majesty and other key royals across the U.K. and overseas during the past year. In addition, leading national and international figures will feature as well as material from the most comprehensive international film archives.

Prince Charles and the Duchess of Cornwall have been interviewed for the special program.

It has also been announced that comedy duo Ant and Dec will host the Queen's 90th Birthday Celebration, which will be broadcast live on ITV later this year.

This event will take place in the presence of the Queen and will be hosted by Royal Windsor Horse Show in the private grounds of Windsor Castle.

The event will see the best of British talent join more than 900 horses and 1,500 participants for what promises to be a spectacular evening. The celebration will tell the story of the Queen's remarkable life from her birth in 1926, through the Second World War to her coronation in 1953 and a reign of more than 63 years.

When Ant and Dec Met The Prince: 40 Years of the Prince's Trust aired at the beginning of the year.

Presenters Ant and Dec said, "We are honoured to be hosting this special celebration of Her Majesty the Queen's 90th birthday. This spectacular evening will bring together some of the best-known names in the entertainment world."

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