Duchess Kate reveals the new obsession shared by Princess Charlotte and Prince Louis

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The Cambridge family on the balcony of Buckingham Palace during 2019 Trooping the Colour on June 8, 2019. Photo: © Samir Hussein/WireImage

Duchess Kate reveals the new obsession shared by Princess Charlotte and Prince Louis

The Cambridge family on the balcony of Buckingham Palace during 2019 Trooping the Colour on June 8, 2019. Photo: © Samir Hussein/WireImage