However, it all went wrong after she seemingly struggled to manoeuvre her ensemble in full view of photographers.
As she walked along, her number came apart and instead of just showing off her never-ending legs, she also exposed her pink, lacy knickers.
Happy birthday to Lady Sarah Chatto, who turned 54 on Tuesday.Sarah was also a chief bridesmaid at Charles' wedding to Princess Diana and is a godmother to their son Prince Harry.Such is Sarah's popularity within the royal family, she was also selected to act as a godmother to Prince Edward's daughter Louise and the Duke of Gloucester's daughter Rose.Lady Sarah Chatto is the Queen's niece Nonetheless, Sarah maintains a close relationship with the senior royals, including her aunt, the Queen.The respect and affection she has for the monarch was clear to see in the BBC documentary in honour of Her Majesty's 90th birthday in 2016, and it appears the feeling is mutual.
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Prince Harry joined the Combined Cadet Force before signing up for the Armed Forces.