(LONDON) — As Queen Elizabeth II took in the Trooping the Color parade from the balcony of Buckingham Palace, her interactions with great-grandson Prince Louis quickly stole hearts.

The two watched military planes fly above the palace as the festivities unfolded in the center of London.

Louis’ older brother and sister, Prince George, 8, and Princess Charlotte, 7, could also been seen on the balcony.

The three siblings arrived at the palace in a horse-drawn carriage with their mother, Kate, the duchess of Cambridge, and Camilla, the duchess of Cornwall.

The 4-year-old is the youngest child of Prince William and Kate. He wore a light sky blue sailor’s outfit, a throwback to his dad’s sailor’s outfit from 1985’s Trooping the Color parade.

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