Prince William and Kate Middleton have been together for more than 20 years, after first meeting at the University of St Andrews, and are said to be as strong as ever

When one a friend of the Princess of Wales told her that she was lucky to have Prince William, she seemingly had a seriously confident five-word comeback, that put the pal in their place

Kate Middleton and Prince William's love story has been well-documented, but the couple have fought to keep their relationship out of the public eye despite their royal status