Sarah Ferguson

Sarah Ferguson

Britain's Duchess of York has written a new book.

Sarah Ferguson - a New York Times bestselling author - has penned children's tome 'Ballerina Rosie' and she took to her twitter account to reveal she is "so excited" about her latest novel hitting the shelves.

She tweeted: "Whooopeeee .. So excited about my new childrens book Ballerina Rosie.its out now!! (sic)"

The picture book tells the story of a girl called Rosie who loves to dance and dreams of becoming a ballerina, but when she joins ballet school she finds it tough to master a number of dance movements such as the pile and jete.

The 52-year-old duchess - who has two kids, Princess Beatrice, 24, and 22-year-old Princess Eugenie with Prince Andrew - has written several children's books including 'Tea for Ruby' and her memoir 'Finding Sarah'.

As well as her writing career, Sarah still finds time to entertain her own children and earlier this week she enjoyed a star-studded night out with Eugenie at an event for charity Freddie for a Day - an AIDs charity set up in the name of Queen rocker Freddie Mercury in 1992 following his death in 1991 - at London's Savoy Hotel.

At the event - which was hosted by Queen musicians Brian May and Roger Taylor - Sarah and Eugenie were amazed by magician Dynamo, who wowed them with his seemingly endless repertoire of tricks, and later that night they watched music legend Sir Tom Jones perform a number of the group's most famous hits.