Alexandra Shân "Tiggy" Legge-Bourke MVO (born 1 April 1965) was nanny, later companion, to Prince William, The Duke of Cambridge and his brother Prince Harry, and a personal assistant to Charles, Prince of Wales, between 1993 and 1999. Since her marriage she has been known as Tiggy Pettifer.
Legge-Bourke is the daughter of William Legge-Bourke (1939–2009), who served in the Royal Horse Guards after taking a degree at Magdalene College, Cambridge, then became a merchant banker at Kleinwort Benson, and was a Deputy Lieutenant of Powys from 1997 until his death. Tiggy's mother, the Hon. Shân Legge-Bourke LVO (born 1943), was the only child of Wilfred Bailey, 3rd Baron Glanusk (1891–1948), a soldier who became a Colonel in the Grenadier Guards and also served as Lord Lieutenant of Brecknockshire. When Shân Bailey's father died in 1948, she and her mother inherited his estate at Glanusk Park, near Crickhowell in Powys, while his peerage went to a cousin. Shân Legge-Bourke was appointed a lady-in-waiting to HRH The Princess Royal in 1987, was High Sheriff of Powys in 1991, and is now Lord Lieutenant of Powys.
Tiggy Legge-Bourke's paternal grandfather, Sir Henry Legge-Bourke (1914–1973) was member of parliament for the Isle of Ely from 1945 until 1973 and was chairman of the 1922 Committee of Conservative backbenchers. His death in 1973 led to a famous by-election, won by the Liberal Clement Freud.