A second film about the Duke and Duchess of Cambridge is about to debut on American television.
William & Catherine: A Royal Romance will be shown on August 27.
It follows in the footsteps of the William & Kate, which aired earlier this year.
Dan Amboyer, who plays William, said: "We are not afraid to explore the real side of the relationship and the challenges."
Alice St Clair, who portrays Kate, said: "Diana features in the film. There is just really a great sense of relationships within the family. So there is William's relationship with his father and his brother, and you see him calling upon Diana's interview, and watching this interview that Diana did and using her words to kind of guide him through his troubled moments."
The movie also features Victor Garber as Prince Charles, Jean Smart as the Duchess of Cornwall and Jane Alexander as the Queen.
Kate's sister Pippa Middleton is mentioned in the tele-movie but does not appear. "JLo was busy, so there wasn't anyone else to play the part," St Clair said jokingly, noting the famous derrieres of both Miss Middleton and singer Jennifer Lopez.