The Duchess of Cambridge has given her first solo television interview for a programme marking the Queen's life and reign.
Kate and other senior members of the Royal Family are paying tribute to the Queen for the ITV programme, due to be screened in the spring to celebrate her 90th birthday.
The Duchess was last interviewed on television by broadcaster Tom Bradby, on the day her engagement to the Duke was announced in November 2010.
With William by her side Kate gave an assured performance, and she is now far more experienced in front of the camera, having made charity videos and taken part in many royal events at home and abroad.
The film, which has the working title The Queen At Ninety, also includes contributions from many key figures in the Queen's life, including the Prince of Wales, the Duchess of Cornwall and William, along with other national and international figures.
Film crews were given access to the Queen as she worked last year and to other members of the monarchy.
Nick Kent, an executive producer from Oxford Film and Television which is making the two-hour programme, said: "We've been fortunate to have the participation of so many members of the Royal Family to mark this historic milestone in the life of the Queen.
"It's a remarkable story of an extraordinary life which in so many ways reflects the changing face of the nation."
Jo Clinton-Davis, ITV's controller of factual, who co-commissioned the programme, said: "As she reaches her 90th birthday, this film aims to offer a fresh insight into our monarch's life and work."
The Queen's 90th will be marked with a weekend of national celebrations around the time of her official birthday in June, and with other events to mark the day she was born, April 21 1926.
ITV also announced that Ant and Dec will host The Queen's 90th Birthday Celebration, a horse-themed event, to be broadcast live in May, that will tell the story of the Queen's life.
The Queen will attend the event hosted by the Royal Windsor Horse Show in the private grounds of Windsor Castle.
Faces from the world of entertainment will take to the stage and in the arena the audience will watch performances from a range of organisations including the Oman Royal Cavalry, New Zealand Army Band, the Mounties and The King's Troop Royal Horse Artillery.