They are two of the world's most high-profile women -- yet have carefully guarded their private lives.

On Thursday, however, US First Lady Melania Trump and Britain's Princess Catherine enjoyed a moment to let down their hair together.

Looking relaxed and smiling broadly, they took part in their first joint official engagement, joyfully playing with children and enjoying some colouring activities, on the final day of President Donald Trump's unprecedented second state visit to Britain.

The pair gathered with a group of young scouts in Frogmore Gardens, on the grounds of Windsor Castle -- not far from the cottage where Prince Harry and his wife Meghan once lived before their estrangement from the royal family.

Fresh from spending the night in the castle with her husband at the invitatio

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