The Thirteenth Doctor photobombed the photograph taken of the newly crowned Queen Elizabeth II and her family on the balcony of Buckingham Palace on 2 June 1953. (COMIC: Where's the Doctor?)
Behind the scenes 
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Technically speaking, the Doctor has "photobombed" various historical photos before. However, the instance shown in Where's the Doctor? is the first time it had been identified as such in-universe.
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