William, Kate and Harry tour "Harry Potter" studio

Kate, Duchess of Cambridge, her husband, Prince William, right, and his brother, Prince Harry, hold their wands on the film set used to depict Diagon Alley in the "Harry Potter" films during the inauguration of Warner Bros. Studios Leavesden near Watford, England, on April 26, 2013. As well as attending the inauguration Friday at the former World War II airfield site, the royals took a tour of Warner Bros. "Studio Tour London - The Making of Harry Potter", where they will viewed props, costumes and models from the "Harry Potter" film series.

Prince Harry, Kate, Duchess of Cambridge, and Prince William raise their wands on the set used to depict Diagon Alley in the "Harry Potter" films during the inauguration of Warner Bros. Studios Leavesden on April 26, 2013, near Watford, England.

Prince William, Kate, Duchess of Cambridge, and Prince Harry walk through the set used to depict the Great Hall at Hogwarts in the "Harry Potter" films during the inauguration of Warner Bros. Studios Leavesden on April 26, 2013, near Watford, England.

Kate, Duchess of Cambridge, center, with her husband, Prince William, second left, and his brother, Prince Harry, second right, walk through the set used to depict Hogwart's Great Hall in the "Harry Potter" films during the inauguration of Warner Bros. Studios Leavesden near Watford, approximately 18 miles north west of central London, on April 26, 2013.

Kate, Duchess of Cambridge looks at the costume for the character Hagrid on display on the set used to depict Hogwart's 'Great Hall' in the Harry Potter films during the inauguration of Warner Bros. Studios Leavesden near Watford, approximately 18 miles north west of central London, on April 26, 2013.

Prince Harry smiles as he stands on the set used to depict The Burrow (the home of the Weasley family) in the "Harry Potter" films during the inauguration of Warner Bros. Studios Leavesden on April 26, 2013, near Watford, England.

Prince William, Kate, Duchess of Cambridge, and Prince Harry smile during the inauguration of Warner Bros. Studios Leavesden on April 26, 2013, near Watford, England.

Kate, Duchess of Cambridge, and Prince William attend the inauguration of Warner Bros. Studios Leavesden on April 26, 2013, near Watford, England.

Prince William touches the "Batpod," which was used in Christopher Nolan's Batman trilogy, during the Inauguration of Warner Bros. Studios Leavesden on April 26, 2013, near Watford, England.

Kate, Duchess of Cambridge, watches her husband, Prince William, as he sits on the "Batpod" during the inauguration of Warner Bros. Studios Leavesden near Watford, England, on April 26, 2013.

Kate, Duchess of Cambridge, watches as Prince William controls the "Batpod," which was used in the Batman films, during the inauguration of Warner Bros. Studios Leavesden on April 26, 2013, near Watford, England.

Prince William and Prince Harry look at a "Batsuit" used in Christopher Nolan's Batman films during the inauguration of Warner Bros. Studios Leavesden on April 26, 2013, near Watford, England.

Prince William and Prince Harry look at the "Tumbler," a vehicle used Christopher Nolan's Batman films, during the inauguration of Warner Bros. Studios Leavesden on April 26, 2013, near Watford, England.

Kate, Duchess of Cambridge, stands with her husband, Prince William, left, and his brother, Prince Harry, right, as they are greeted upon their arrival to attend the inauguration of Warner Bros. Studios Leavesden near Watford, England, on April 26, 2013.

Kate, Duchess of Cambridge, left, and Prince William arrive at the inauguration of Warner Bros. Studios Leavesden near Watford, England, on April 26, 2013.

Prince William and Kate, Duchess of Cambridge, arrive at the inauguration of Warner Bros. Studios Leavesdenon on April 26, 2013, in Hertfordshire, England.

Kate, Duchess of Cambridge, and Prince Harry arrive at the inauguration of Warner Bros. Studios Leavesdenon on April 26, 2013, in Hertfordshire, England.

Kate, Duchess of Cambridge, arrives at the inauguration of Warner Bros. Studios Leavesdenon on April 26, 2013, in Hertfordshire, England.