Prince William attended the Order Of The Garter Service at St George's Chapel in Windsor, England on Monday.

Decked out in full regalia including a white-plumed hat, the Duke of Cambridge had to do without his leading lady, who made her last public appearance a few days earlier as she gets ready to welcome their bundle of joy.

This past weekend, Kate Middleton joined her hubby and Prince Harry for Queen Elizabeth's birthday parade in London.

Later, all the royals headed to the balcony of Buckingham Palace to watch the Royal Air Force do a fly-past.