Kate and William happy in love at Windsor Castle
The Duchess of Cambridge looked resplendent in pale blue as she watched her doting husband William take part in The Order of the Garter service,
Kate wore a sky blue coat by Christopher Kane and hat by Lock & Co.
She stood under a canopy, sheltered out of the downpour in the chapel's Galilee Porch.
As her doting husband William walked by, he couldn't resist a quick glance at a beaming Kate.
Kate stood with the Countess of Wessex and they watched as the Queen, Duke of Edinburgh, Prince of Wales, Duke of Cambridge, Duke of York, Earl of Wessex and other Garter Knights walked by wearing their blue velvet robes and black velvet hats with white plumes.
The two young pages of honour held the Queen's long train off the ground as she walked past more than 7,000 spectators.
The Duchess of Cornwall was due to join the royal party but earlier Clarence House said she would miss the event after developing sinusitis.
A Clarence House spokesman said: "The Duchess has been advised by doctors to rest having had a heavy cold which has turned into sinusitis. She very much hopes to attend Ascot tomorrow."
The Order of the Garter service is an important day in the royal calendar when Garter knights celebrate the ancient order. The Queen is its sovereign and a number of other British and foreign royals are additional knights of the order.
New appointments are announced on St George's Day but the chivalric and installation ceremonies take place on the Monday of Royal Ascot week, known as Garter Day.
After the service the senior members of the Royal Family travelled by carriage from St George's Chapel up the hill to Windsor Castle.
Among the crowds of 7,000 invited to watch the procession inside the castle grounds was Kaz Aston, 40, from Windsor who runs charity website Monarchy Online.
She said: "This is the seventh time I have been, I come every year with a group of supporters of the charity. It get's better every time.
"It's got particularly exciting in the past few years with William and Kate.
"We missed her last year when she was pregnant but everyone was screaming loudly for Prince William.
"She looked lovely today, the pale blue is a lovely colour."