Princess Beatrice has stepped in for Prince William at a key event, as the Prince of Wales supported King Charles in the absence of Princess Kate and Princess Anne.
On Tuesday, Prince William attended events during the Japanese State Visit, including a carriage ride down The Mall and a State Banquet at Buckingham Palace in the evening.
The Emperor and Empress of Japan are visiting the UK at the invitation of King Charles and Queen Camilla.
As a result, the Prince of Wales, 42, could not attend the Earthshot Prize Water Roundtable, which was held on the same day.
Princess Beatrice and Prince William are close first cousins
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William, who founded the Earthshot Prize in 2020, holds an annual awards show to celebrate those finding solutions to climate change.
His cousin Princess Beatrice attended the Earthshot Prize Water Roundtable in his place on Tuesday, which brought together investors and philanthropists to explore water as an emerging investment theme.
One fan posted on social media: "Well done Beatrice, you’re really stepping up and supporting the family."
Another wrote: "Wonderful to hear! I hope we see more of Princess Beatrice."
Princess Beatrice sat at a roundtable discussion for the Earthshot Prize Awards
X / Earthshot Prize
Similarly, someone said: "Princess Beatrice is a very qualified person in certain business fields.
"She just hides her light under a bushel."
Another added: "Glad to see you looking confident and in control while helping out.
"I am certain that you will do a fine job now and in the future. Best wishes to you."
Princess Beatrice stepped up for William while the Prince of Wales supported King Charles
X / Earthshot Prize
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Prince William attended a State Banquet at Buckingham Palace hosted by King Charles
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One royal watcher commented: "Good to see Princess Beatrice stepping up with the royals - she’s an asset."
Finally, someone said: "Excellent! @EarthshotPrize is on an extraordinary result-driven mission committed to making a significant difference worldwide RE: our environment!
"Innovators and their incredible doable solutions to repair/restore the planet give us all hope we can regenerate the planet!"