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The Earl and Countess of Wessex joined the Duke and Duchess of Cambridge at the annual garden party.
For the occasion, Sophie donned a blue midi dress which she combined with a matching hat.
The long-sleeve gown, by designer Emilia Wickstead, is the same dress she wore for Ascot a few years ago.
The royal finished the look with a pair of cream stilettos.
A cute straw bag finished Sophie's stylish outfit.
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The Countess of Wessex opted for a natural make-up look and styled her hair in a chic low bun.
The royal was seen wearing a pearl bracelet and a beautiful diamond brooch in the shape of a flower.
Fans took to social media to comment on Sophie's fashion choice.
Twitter user @servingsophie said: "I love this dress and this colour on HRH is beautiful."
The Duchess of Cambridge opted for a beautiful pastel blue dress made by her private dressmaker.
The vintage-style gown reminded fans of the iconic Mary Poppins dress with social media user @Caitlin07131997 saying: "Love this! I am getting Mary Poppins vibes!"
Just like Mary Poppins, Kate also carried an umbrella to ensure her gorgeous dress remained dry.
The pale blue dress features a high collar, full skirt and loose sleeves with a fitted cuff.
Kate donned a matching hat with a flower on the side and a pair of pastel blue stilettos.
For jewellery, the Duchess was seen wearing a pair of delicate drop earrings.
Twitter account @loveforcambridg commented: "Our Duchess looking gorgeous as always."
Princess Beatrice and the Duke and Duchess of Gloucester also attended the annual garden party.
Princess Beatrice wore a brown and white midi dress and a matching headband.
The royal finished her look with black stilettos and a matching clutch.
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