Lady Louise Windsor was born on November 8, 2003, to the Prince Edward, Earl of Wessex and Sophie, Countess of Wessex. She's the youngest granddaughter of Queen Elizabeth and Prince Philip.
She has a younger brother, James, Viscount Severn.
Louise served as a bridesmaid in Prince William's 2011 wedding to Catherine Middleton. She is a member of the UK's Girl Guides (like Girl Scouts in the US).
Photo: Mark Jones/CC/Flickr