It was just as well the Duke of Cambridge gripped the Prime Minister's hand to steady her at a service to mark the centenary of the Battle of Amiens.

A snap of the pair shows Theresa May locked in an awkward position, looking like she was about to topple over as she made a very deep, unpolished curtsy in front of the royal.

The centenary of a key turning point in the First World War was marked yesterday with a solemn service at Amiens Cathedral, according to the Daily Mail.

The Duke of Cambridge is greeted by an awkward-looking Prime Minister Theresa May as he arrives at Amiens Cathedral, France. Photo / AP
The Duke of Cambridge is greeted by an awkward-looking Prime Minister Theresa May as he arrives at Amiens Cathedral, France. Photo / AP

Twitter users reacted with astonishment to the PM's extra-low curtsy when she met Prince William yesterday.

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May and Prince William paid tribute to the bravery of troops who fought in the Battle of Amiens at the event, which was staged exactly 100 years since the start of the offensive.

However, while greeting the Duke of Cambridge at the event the PM nearly scraped a knee on the paving as she lunged deeply, in a painful-looking maneouvre, which led to Twitter users to call for a whip-round to raise cash so she can be taught to do the gesture with more grace.

But, as the following photographs show, it is not the first time May has struggled while performing a curtsy for him and other royals.

Queen Elizabeth II welcomes Theresa May at the start of an audience where she invited the former Home Secretary to become Prime Minister and form a new government. Photo / Getty Images
Queen Elizabeth II welcomes Theresa May at the start of an audience where she invited the former Home Secretary to become Prime Minister and form a new government. Photo / Getty Images
British Prime Minister Theresa May curtseys as she greets Queen Elizabeth II, alongside, Foreign Secretary Boris Johnson and Home Secretary Amber Rudd. Photo / Getty Images
British Prime Minister Theresa May curtseys as she greets Queen Elizabeth II, alongside, Foreign Secretary Boris Johnson and Home Secretary Amber Rudd. Photo / Getty Images
British Prime Minister Theresa May curtsies as Britain's Queen Elizabeth II arrives at a Ceremonial Welcome for Spain's King Felipe and Queen Letizia on Horse Guards Parade in London. Photo / AP
British Prime Minister Theresa May curtsies as Britain's Queen Elizabeth II arrives at a Ceremonial Welcome for Spain's King Felipe and Queen Letizia on Horse Guards Parade in London. Photo / AP