Kate Middleton is set to make her first television interview since her marriage to Prince William. The Duchess of Cambridge’s TV appearance will be for an upcoming special two hour documentary about Queen Elizabeth II.

Princess Kate will join other members of the royal family who will appear in the documentary to honor Queen Elizabeth II on her upcoming 90th birthday, Entertainment Tonight reported. The last time the now mother of two appeared on TV was in 2010, after she got engaged with Prince William. Other royals expected to join the TV special includes Prince William, Prince Charles and Camilla, Duchess of Cornwall.

The upcoming Queen Elizabeth II TV documentary currently has a working title of “The Queen At Ninety” and will feature a look at her “life and reign.” Nick Kent, executive producer for Oxford Film and Television shared that they were fortunate to have many members of the royal family participate in the TV special. "It's a remarkable story of an extraordinary life, which in so many ways reflects the changing face of the nation,” he added.

“The Queen At Ninety” will also be hosted by the duo Ant and Dec. The TV documentary is expected to air in May on ITV, following Queen Elizabeth II’s birthday on April 21.

Apart from Princess Kate’s upcoming TV appearance, royal watchers will also see her during the upcoming 75th anniversary celebration of the Royal Air Force Air Cadets. The event will mark the Duchess of Cambridge’s first official engagement for a new military related role. The honorary title of Honorary Air Commandant was conferred to her in December by Prince Philip, when he entrusted his patronage for the Air Force organization.

The Royal Air Force Air Cadets celebration will be held on Feb. 7 at London’s St. Clement Danes church. Princess Kate is also expected to attend the event’s reception at the Royal Courts of Justice.