Queen Elizabeth II is getting in on the Instagram fun.

The queen published her first post on the Royal Family’s Instagram page on Thursday to celebrate her visit to the Science Museum in London. The post was a picture of an old letter sent to Prince Albert from 19th-century mathematician Charles Babbage.

“Today, as I visit the Science Museum I was interested to discover a letter from the Royal Archives, written in 1843 to my great-great-grandfather Prince Albert,” the queen wrote in the Thursday post. “Charles Babbage, credited as the world’s first computer pioneer, designed the ‘Difference Engine’, of which Prince Albert had the opportunity to see a prototype in July 1843.”

“In the letter, Babbage told Queen Victoria and Prince Albert about his invention the ‘Analytical Engine’ upon which the first computer programmes were created by Ada Lovelace, a daughter of Lord Byron,” she continued. “Today, I had the pleasure of learning about children’s computer coding initiatives and it seems fitting to me that I publish this Instagram post, at the Science Museum which has long championed technology, innovation and inspired the next generation of inventors.”

The queen ended the post by signing it, “Elizabeth R.” The letter R stands for Regina, which means "queen" in Latin.

Britain's Queen Elizabeth II walks with Science Museum Director Ian Blatchford during a visit to the Science Museum for the announcement of their summer exhibition "Top Secret" in Kensington, London. (AP)

Queen Elizabeth visited the museum to announce a new exhibition, "Top Secret: From Ciphers to Cyber Security."

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“We were honoured to welcome Her Majesty The Queen to the Science Museum today, where The Queen shared a post on Instagram for the first time and announced a new major exhibition, Top Secret: From Ciphers to Cyber Security,” the museum wrote in its own post.

The Royal Family account was set up in 2013 to share photos and information from the British royals. It currently has 4.6 million followers.

The queen also posted her first tweet on The Royal Family’s Twitter account in 2014 at the Science Museum.

Kensington Palace announced earlier this week it was implementing guidelines for its social media channels in the wake of the online abuse against the Duchesses of Cambridge and Sussex in recent months.

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The family said the guidelines have been put in place to “help create a safe environment on all social media channels,” which include the Royal Family, Clarence House and Kensington Palace. Users who post obscene or offensive content on the social media pages will be blocked or reported to police, the palace warned.