It had been a closely guarded secret for months, but now Meghan Markle's first royal patronage has been revealed thanks to an online blunder.

On Wednesday The National Theatre published and then swiftly deleted a post on its website announcing the Duchess of Sussex was its new royal patron.

Unfortunately the theatre company's premature announcement was spotted by The Telegraph, which shared a screenshot of the post online.

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The National Theatre's post confirmed speculation Meghan would be taking over from Queen Elizabeth, who has been a long time patron of the organisation.

The Duchess's new patronage is a perfect fit for the former actress, who rose to fame starring on legal drama Suits.

Meghan also recently met with The National Theatre's artistic director Rufus Norris at the palace, The Telegraph reports.

Since marrying Prince Harry last May Meghan has made several appearances as events related to the arts.

Meghan, Duchess of Sussex puts a bracelet on Patsy Wardally during her visit to charity styling centre, Smart Works. Smart Works is one of the four organisations which she has become Royal Patron. Photo / Getty Images
Meghan, Duchess of Sussex puts a bracelet on Patsy Wardally during her visit to charity styling centre, Smart Works. Smart Works is one of the four organisations which she has become Royal Patron. Photo / Getty Images

Last month, the pregnant royal paid a visit to Brinsworth House, a nursing home for British entertainers run by the Royal Variety Charity.

The Duchess of Sussex also attended the Royal Variety Performance in November and a charity performance of musical Hamilton in August.

A day after The National Theatre's online gaffe Kensington Palace officially confirmed the Duchess of Sussex would be supporting the arts group alongside three other organisations.

Markle visits nursing home Brinsworth House. Photo / Getty Images
Markle visits nursing home Brinsworth House. Photo / Getty Images

Meghan will be the patron of the Association of Commonwealth Universities, animal welfare charity Mayhew and Smart Works; an organisation that aims to help long term unemployed women find work by gaining new skills and confidence.