They were once the closest of friends, bound by their royal duties and in the grief of losing their mother so young.
In recent years, however, things have changed between Princes William and Harry, so much so that it is believed the pair have been in a bitter feud ever since one Meghan Markle entered the fray.
But now that the Duke of Sussex, wife Meghan and young son, Archie, have completed their drastic move to LA, it appears things are slowly mending between the princes.
Royal expert Katie Nicholl told Entertainment Tonight: "There have been clearly some quite major rifts in that relationship, but things have got better and I know that William and Harry are in touch on the phone.