The 1-year-old princess, whom mum Princess Kate described on Friday as "cute but feisty", joined her nearly 3-year-old big brother Prince George (a balcony pro!) and parents Prince William and Kate as they capped a morning of parades and festivities for the annual celebration known as Trooping the Colour.
The royals gathered around matriarch and record-breaking monarch Queen Elizabeth to top off the celebration of her official birthday. (Her actual 90th birthday was April 21.)
George had a bit of a style re-wear as he wore a similar, short-sleeved version of the ensemble he wore for his first portraits with Charlotte last year. (It's also very similar to an outfit William wore to Prince Harry's christening.) Charlotte, meanwhile, wore a sweet pink dress with a tiny matching bow.
During the flypast, George had his right hand to his face appearing to shield an eye as he looked skyward at the Red Arrow Display team. Charlotte, meanwhile, had her thumb and then her hand in her mouth and grimaced as the planes went over. Mum Kate comforted her by rubbing her little leg.
The extended Windsor clan traditionally gathers on the famous balcony to view the crowds below and to see the soldiers resplendent in their ceremonial dress as well as the roaring fly-past by the Royal Air Force.
Last year, it was George's turn to take center stage as he waved from his dad arms for the first time on the balcony.