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One photo shows Ernest sleeping while wearing a blue and white knitted hat, while a second photo shows August touching the head of his baby brother.

\"Augie is loving being a big brother already,\" Eugenie wrote on Instagram.

Eugenie also shared the meaning behind Ernest's name, writing, \"He is named after his great great great Grandfather George, his Grandpa George and my Grandpa Ronald.\"

Just weeks before giving birth, Eugenie joined Brooksbank in attending the coronation of her uncle, King Charles III, at Westminster Abbey.

\"PHOTO:
Jacob King - Pa Images/PA Images via Getty Images, FILE
PHOTO: FILE - The Duke of Sussex Princess Eugenie and Jack Brooksbank leaving Westminster Abbey in central London following the coronation of King Charles III and Queen Camilla, May 6, 2023.
>

Ernest has now made history as the first royal baby born during Charles' reign.

The newborn was also just days shy of sharing a birthday with another royal family member, Lilibet, the daughter of Eugenie's cousin Prince Harry and his wife Meghan, the Duchess of Sussex.

Lilibet, who lives in Southern California with Harry, Meghan and her big brother Archie, turned 2 on June 4.

Eugenie is known to be close with Harry and Meghan. She visited them last year in California, where she attended the Super Bowl with Harry.

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