Millions across the globe tuned in to witness King Charles III and his wife, Queen Camilla, formally crowned on May 6 — the first British coronation in 70 years. But for many, the new monarch’s grandchildren stole the show. Clad in a gold-trimmed red tunic and white gloves, Prince George, 9, delighted viewers as he stuck out his tongue alongside the other pages of honor. Princess Charlotte, 8, was the picture of poise in a caped dress as she held hands with their rascal of a brother, Prince Louis, 5, who yawned, sang, and made faces inside London’s Westminster Abbey while wearing a pint-size bespoke suit. George was “excited” about his special role, but also “a bit nervous,” mom Princess Kate confessed to well-wishers beforehand, though, “having done a few…