Prince William, Princess Kate unlock new milestone as truth exposed

Prince William and Princess Kate stepped out for a very special outing, achieving a major royal milestone.

Royal author Rebecca English shared the latest videos and photos from the royal couple's arrival at the Isle of Bute.

William and Catherine were given the titles of Duke and Duchess of Rothesay by the town they are visiting today, September 17.

It is their first official visit to the island, and the couple will undertake "three engagements promoting the power of community."

The Prince and Princess of Wales put on a united front despite the latest revelation in the first preview of Charles Spencer's upcoming book, Swan Song: Diana, My Sister.

As per the Daily Mail, the author penned, "Prince Charles continued his stream of anger, without me interrupting. Then he stopped. 

I assumed the pause signalled an effort to bring himself under control, but then he unleashed down the phone what I have always taken to be his pent-up contempt for Diana, and his horror that the world was so bowled over by her death.”

"'Rest assured,' he hissed, 'we’ll forget her soon enough!'" Spencer wrote about a phone call with his former brother-in-law, which left him in shock.

Prince Harry and Meghan Markle reportedly knew about the controversial book, suggesting that Prince William's concerns about the Sussexes being untrustworthy may be valid.