Future queen: Duchess of Cambridge turns 40

Since marrying into Britain's most famous family in 2011, the former Kate Middleton has emerged to become one of the most popular royals -- and a figure central to its future

Catherine, Duchess of Cambridge, turned 40 on Sunday, hitting the milestone as her profile soars alongside her husband, Prince William, the future king.

Both Kate and William, who turns 40 in June, have been much more visible public figures since the start of the global health crisis.