The Duchess of York, 61, has written a number of children's books and just recently released her first book targeted at an older audience. Fergie has said her children's books have made her a star amongst the younger generation.

       According to the Duchess, Wolfie, five, who is Princess Beatrice's husband Edoardo Mapelli Mozzi's son, thinks his step-grandmother is a “star”.

       “For him... I'm very cool,” she said on the Femail Half-Hour podcast.

       “He thinks I'm a star because he sees me on television, on YouTube.”

       She also added the five-year-old sees her as the “Jennifer Aniston of his life”.

       READ MORE: Sarah Ferguson admits parallels with own life in adult novel

       The royal released her first adult novel A Heart for a Compass on August 3.

       Following the success of the novel, Fergie has just announced she has signed a second book deal with Mills & Boon.

       “We all have self-doubt,” she said on Radio 4's Front Row.

       “But it was really exciting to grow together in friendship and collaboration and we're both very unified together in this book Her Heart For A Compass.

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       “So much so, we've signed our next book deal.”

       The book is co-written by Marguerite Kaye and is based on the life of Fergie's great-great-aunt, Lady Margaret Montagu Douglas Scott.

       According to insiders, the pair wish to turn the unreleased book into a TV series.

       "[Sarah's team] is already in talks with at least one streaming service and will be approaching others once a 360-degree treatment of the book is finalised," a source told Variety.

       “Everyone involved is looking at the success of Bridgerton as a demonstration of the immense appeal of period drama on streaming services."