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 
Edit
Technically speaking, the Doctor has "photobombed" various historical photos before. The instance shown in Where's the Doctor? is the first time they've identified it as such, however.
