Last year, Prince Harry and Meghan Markle signed a two-year lease on a home in the Great Tew area of the Cotswolds. She has previously advocated for gender equality and improvement of women's education.
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American-born and Los Angeles raised Meghan, who had a successful acting career before joining the Royal Family, is thought to be a flawless fit for the role which will see her help a theatre that was founded in 1963. It is one of the roles handed to her by her grandmother-in-law, Queen Elizabeth.
"The Duchess is delighted to become Patron of both national and grassroots organisations that are part of the fabric of the United Kingdom, and is very much looking forward to working with them to bring wider public attention to their causes", Kensington Palace said in a statement.
The organizations were naturally delighted to have Meghan's endorsement. She also served as an ambassador for United Nations Women.
Information about Her Royal Highness taking on the National Theatre role was accidentally leaked yesterday on the organisation's website.
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She will also work with The Association of Commonwealth Universities (ACU) and an animal welfare charity, Mayhew.
Patronages are often life-long commitments, with the chosen royal having a strong interest in the subject matter.
In December, the Duchess invited the director of the National Theatre, Rufus Norris, to a private meeting where they discussed plans for when she is the Patron of the National Theatre. "I very much look forward to working closely with Her Royal Highness in the years to come".
The announcement is a major milestone for the American-born former actress, outlining the first steps of her public life as a member of the monarchy.
Rumours of a royal rift between the women began swirling after news emerged that Meghan and Harry will move away from Kensington Palace to make their home 25 miles away from the Duke and Duchess of Cambridge in Windsor.
During the next few weeks, the Duchess will then make public visits to the other three organisations. "The Duchess' patronage will inspire the women we serve and help them reach for the stars".