William & Catherine: A Royal Romance will focus on the relationship between the couple, their wedding planning and the advice they received from the Queen.
Oscar-nominated actress Jane Alexander will take on the role of Queen Elizabeth II, while Alias, Legally Blonde and Titanic star Victor Garber will play Prince Charles.
Jean Smart, who starred in 24 and has recently had roles in Hawaii Five-0 and $#*! My Dad Says, will play the Duchess of Cornwall, Camilla Parker Bowles.
Meanwhile, the Duke and Duchess of Cambridge will be portrayed by Dan Amboyer and Alice St. Clair.
The film will be executive produced by Linda Yellen, who previously worked on The Royal Romance of Charles and Diana, and Brad Krevoy.
Production has started in Bucharest and the film is expected to air on August 27.
> Read our complete coverage of the Duke and Duchess of Cambridge