It's the passing of the baton to a new generation of royals at the 60th anniversary of the Queen's Coronation.
All eyes were on the royal couple, Prince William and Kate, as they arrived with Prince Harry at Westminster Abbey.
They all sat together in the front row just a few seats from their grandmother, the Queen.
It was just two years ago that the whole world watched William and Kate's spectacular wedding at the very same Westminster Abbey.
Today, pregnant Kate wore a blush-colored outfit topped off with a silk-beaded cocktail hat.
Kate looked radiant with her due date now just six weeks away.