Kate Middleton and Prince William‘s youngest child, 1, joined his older siblings, Prince George, 5, and Princess Charlotte, 4, as well as other members of the royal family at the big event to celebrate Queen Elizabeth‘s birthday.
Little Lou was all smiles on the balcony, as he wore a blue and white outfit and waved at the crowd below. In fact, it looked like waving was his favorite part. Louis even eagerly pointed at planes in the sky while in his mother’s arms!
Scroll on down below to see Louis’ balcony debut at Trooping the Colour!