Princess Eugenie and her sister Princess Beatrice decided to play it safe with their fashion choices after their outfits for the Royal Wedding caused such a stir.
Beatrice kept it simple on the day, while Eugenie decided to support patriotic nails.
The 22-year-old had Union flags on her fingernails for the start of the Diamond Jubilee celebrations.
As well as chatting to guests, the two princess also enjoyed the racing from the balcony.
The two princesses and The Queen were treated to a performance by Katherine Jenkins singing the National Anthem, and they also watched Britain's Got Talent winners Pudsey and Ashleigh do their routine.
Meanwhile, Jenkins admitted that she was having an "amazing" day.
She said: "It's incredible. I've been out of the country for three months, so to come back and do this is great."
Speaking about how it felt to perform for the Queen, Jenkins told the Daily Mail: "For me it's such a huge honour.
"It's the first time that the National Anthem has been sung during these celebrations and I would never have hesitated. I would have sung to her in the rain."
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