Princes William and Harry write their initials on the soles of their shoes after finding they kept picking up the wrong ones at their London flat.

“They often exchanged their shoes by mistake and that prompted the unique solution, according to the Sunday Times newspaper.

It was revealed when someone spotted a “W” on William’s shoes at a charity gala he attended with his new wife Catherine.

The newlyweds who are waiting to move to Kensington Palace are sharing an apartment at Clarence House with Harry.

“William and Harry have similar shoe sizes and thus they avoid confusing them, a royal family source told the weekly newspaper.

William and Catherine live in north Wales, where the prince works as a search and rescue helicopter pilot, but they stay in London while attending official engagements.