Brightening up the rainy river pageant, the Duchess of Cambridge looked radiant in her red Alexander McQueen dress topped off with a flamboyant, scarlet Sylvie Fletcher hat.
As a nod to her Scottish title - the Countess of Stratheam - she carried a tartan scarf too.
The much loved Royal, accompanied by her husband Prince Phillip, waved to the crowds who despite the gloomy weather had gathered along the River Thames to watch the family board the gilded barge.
Kate's husband The Duke of Cambridge wore his Flight Lieutenant No 1 Dress Uniform while his British Army Captain brother Prince Harry wore the No 1 Ceremonial dress of the Blues and Royals.
Kate's family including her mom Carole, dad Michael, sister Pippa and brother James joined the rest of the royals for the on board fun.
Queen Elizabeth is being celebrated by her family and all of the UK for her 60 years of reign.