NEWSQueen Elizabeth IIAdd TopicQueen Elizabeth II celebrates her 90th birthdayQueen Elizabeth II meets the public on her 90th birthday 'walkabout' on April 21, 2016 in Windsor, England. Thousands of people turned out to wish Britain's longest serving monarch a happy birthday.Chris Jackson, Getty ImagesQueen Elizabeth II wore a cheery grass-green coat (and a matching floral hat) for her 90th birthday appearance.WPA Pool, Getty ImagesBritain's Queen Elizabeth II and Prince Philip, the Duke of Edinburgh wave to well-wishers during her 90th birthday celebrations in Windsor, Britain on April 21, 2016.Andy Rain, European Pressphoto AgencyBritain's Queen Elizabeth II greets well-wishers during a 'walkabout' on her 90th birthday in Windsor, west of London, on April 21, 2016. Britain celebrates Queen Elizabeth II's 90th birthday on Thursday, with her eldest son Prince Charles paying tribute in a special radio broadcast and Prime Minister David Cameron leading a parliamentary homage.Justin Tallis, AFP/Getty ImagesThe 'Three Criers' Tony Appleton, Steve Clow and Peter Baker prepare for the Queen's 90th Birthday Walkabout on April 21, 2016 in Windsor, England.Chris Jackson, Getty ImagesQueen Elizabeth II meets well wishers on a walk about around Windsor on her 90th birthday.Samir Hussein, WireImageA royal supporter is pictured outside Windsor Castle, west of London, on April 21, 2016, as Britain's Queen Elizabeth II celebrates her 90th birthday.Ben Stansall, AFP/Getty ImagesBritain's Queen Elizabeth II (centre L) accompanied by her husband Prince Philip, Duke of Edinburgh greet wellwishers during a 'walkabout.' on her 90th birthday in Windsor.Justin Tallis, AFP/Getty ImagesRoyal well-wishers try too grab a glimpse of Britain's Queen Elizabeth II during her 90th birthday celebrations in Windso.Andy Rain, European Pressphoto AgencyRoyal well-wishers await the arrival of Britain's Queen Elizabeth II during her 90th birthday celebrations in Windsor.Andy Rain, European Pressphoto AgencyQueen Elizabeth II meets the public on her 90th birthday ''walkabout' in Windsor.WPA Pool, Getty ImagesRoyal well-wishers await the arrival of Britain's Queen Elizabeth II during her 90th birthday celebrations in Windsor.Andy Rain, European Pressphoto AgencyQueen Elizabeth II meets the public on her 90th Birthday Walkabout on April 21, 2016 in Windsor.WPA Pool, Getty ImagesWellwishers gather as Queen Elizabeth II meets the public on her 90th Birthday Walkabout in Windsor.Ian Gavan, Getty ImagesBritain's Queen Elizabeth II greets wellwishers during a 'walkabout' on her 90th birthday.JOHN STILLWELL, AFP/Getty ImagesQueen Elizabeth II accepts a bouquet of flowers from well wishers during her 90th birthday 'walkabout.'Samir Hussein, WireImageBritain's Queen Elizabeth II (L) and Prince Philip, Duke of Edinburgh study a plaque after unveiling it during a 'walkabout' on her 90th birthday in Windsor.John Stillwell, AFP/Getty ImagesQueen Elizabeth II receives a gift during her 90th birthday 'walkabout.'WPA Pool, Getty ImagesQueen Elizabeth II receives a birthday cake from Nadiya Hussain, winner of the Great British Bake Off, during her 90th birthday 'walkabout' on April 21, 2016 in Windsor.WPA Pool, Getty ImagesFeatured Weekly Ad