A number of other stars were also at the Wimbledon final and in the Royal Box alongside the royals, including actors Tom Cruise, Julia Roberts, Zendaya, Jamie Dornan and his wife Amelia Warner and Benedict Cumberbatch.

Known widely as Kate Middleton, she travelled in a carriage with her three children at the beginning of the yearly celebration and then stepped off to observe the events from a designated spot.

Kate has been receiving cancer treatment and has temporarily stepped back from her Royal duties, as confirmed in a pre-recorded video on March 22 after being out of the public eye for several months.

The official birthday ceremony of the British Sovereign, scheduled for June 15, is marked each year by a military parade and march-past known as Trooping the Colour or the King's Birthday Parade.

Seventy-five-year-old Charles had suspended public duties in February after being diagnosed with cancer while he was being treated for an enlarged prostate the previous month.

Although details of the cancer have not been revealed, Kensington Palace says the princess is sure that she will make a full recovery. Catherine went through an abdominal surgery in January, but it was not known that it would degrade to form a cancer.

In a personal video message released by Kensington Palace, a weak looking Kate said her planned “major” abdominal surgery in January was “successful” and it was initially thought her condition was non-cancerous.

The former England cricketer, who lives near the couple in Windsor, slammed online rumours about the Duchess of Cambridge as she continues her recovery from abdominal surgery.