Kate Middleton as future queen makes key decisions to protect royals: expert

True Royalty TV co-founder Nick Bullen reveals how "Waity Katie" became Britain's "Reliable Royal." Kate Middleton is the wife of Prince William, heir to the throne.

The streaming platform has a new documentary, "Catherine: Our Queen in Waiting," which explores how Prince William’s wife has charmed palace aides, the public and the press over the years. Stephanie Nolasco covers entertainment at Foxnews.com.

"The interesting thing about Kate, the Princess of Wales, is her steeliness," Bullen said. "She is a very strong character who has transitioned from being a young bride to being a key player within the royal family. ... If you look at all the photographs now, she’s always front and center. She looked amazing at the coronation, she looked incredible at Ascot. She’s now every inch the princess. And I think at the coronation, everyone agreed that she looked very much the next queen."