William wed his former university flatmate Kate Middleton on April 29 2011 in the grand surrounds of Westminster Abbey, with millions across the world watching the televised service.
Five years later, the couple have two children – future king Prince George and spare to the heir Princess Charlotte – and are settled into family life in Norfolk, living in their 10 bedroom mansion Anmer Hall.
Kensington Palace said the Cambridges will mark the day privately. They are likely to be spending time catching up with two-year-old George and Charlotte, who turns one on Monday, after being parted from them while away in India and Bhutan.
Although the traditional gift on a fifth wedding anniversary is wood, the Duchess is often seen sporting new pieces of jewellery – apparently from her husband – around the time of their anniversary.
Less than two weeks ago, the Duke and Duchess were pictured sitting in front of the Taj Mahal – the monument to love – where Diana, Princess of Wales sat alone 24 years earlier shortly before the breakdown of her marriage.
Royal watchers who observed the couple said they appeared very much in love and happy in each other’s company during their royal tour.