The seriously sweet Instagram post also featured a hidden Taylor Swift reference —pretty unsurprising given that William took Charlotte and George to see the Eras Tour in London. Sadly, Prince Louis didn't attend the epic concert, where the royals met Swift and her boyfriend, Travis Kelce.

On Sunday, the king shared a throwback photo of himself and his sister, Princess Anne, playing on the swings with their late father, Prince Philip.

The Prince and Princess of Wales's official Instagram account shared two new photos of William posing with George, Charlotte, and Louis, with the caption, "Happy Father's Day, Pap

Prince Harry is a hands-on father. That’s what Meghan Markle is making sure royal fans know — his best role in life is as Prince Archie, 6, and Princess Lilibet’s, 4, dad. His proactive role in his children’s lives was seen in the Duchess of Sussex’s sweet Father’s Day tribute to her husband on Instagram.