Allegra was born in London, and raised in Ireland, Long Island and Los Angeles. She worked in publishing as editorial director of Weidenfield and Nicholson, and then as a freelance writer her work appearing in The Times, The Independent, Vogue and Tatler. Her biography, LOVE CHILD, about her extraordinary childhood, topped the bestsellers list. In 2011 she produced and wrote the award winning short film, GOOD LUCK MR GORSKI. She lives in Taos New Mexico.