Princess Charlotte and Prince Louis.Photo: Dan Charity - WPA Pool/Getty

Their Majesties King Charles III And Queen Camilla - Coronation Day

Princess Charlottehad a lazy Sunday!

During a surprise appearance along the Long Walk outside Windsor Castle with his wife the Princess of Wales,Prince Williamopened up about his 8-year-old daughter’s absence at the event.

“She’s very tired after yesterday,” the Prince of Wales, 40, told a young girl,according toHello!magazine. “She’s having a quiet day at home. It was making sure her little brother behaved himself.”

Charlotte, who wore a leafy headpiece that matched her mom’s tiara for the special occasion on Saturday, was seen throughout coronation day minding her 5-year-old brotherPrince Louis.

While their older brotherPrince George— who is second in the line of succession behind his father — served as aPage of Honorfor his grandfather, Charlotte held Louis' hand as the family arrived for the historic event.

Princess Charlotte and Prince Louis.Yui Mok - WPA Pool/Getty

Their Majesties King Charles III And Queen Camilla - Coronation Day

As one of the youngest members of the royal family in attendance, Louis left the ceremony for a likely planned respite, but later rejoined his parents and siblings in the procession out of Westminster Abbey following the crowning.

Louis was photographed waving — and yawning again — during thecarriage ride following the ceremonyas part of the Coronation Procession.

Upon arriving at Buckingham Palace and appearing on the balcony alongsideKing CharlesandQueen Camilla, Louis seemed to point out the Red Arrows' planes as they flew over Buckingham Palace. At one point, Louis even let out a yelp — to the delight of his parents and Charlotte — during the flypast, which was scaled down due to rain, causing his family members to erupt into laughter.

Kate Middleton, Princess Charlotte and Prince George.Getty

CORONATION CONCERT AT WINDSOR CASTLE

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Meanwhile, though Charlotte stayed in for the Long Walk during the day, she did join her parents and brother George for the coronation concert Sunday night. For the outing, she wore a cream ruffled dress with a black bow. As the sun set, she put on a cream coat.

Performers at the star-studded event includedAndrea Bocelli, Olly Murs,Nicole Scherzinger, Steve Winwood,Katy PerryandLionel Richie.

source: people.com