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Cecelia Ahern was born on September 30, 1981 in Dublin, Ireland. She is the daughter of the former Irish Taoiseach Bertie Ahern. Cecelia was a member of the Irish pop group Shimma who finished third in the Irish national for the Eurovision Song Contest in 2000. She attended Griffith College Dublin and obtained a degree in Journalism and Media Communications.

Cecelia Ahern wrote her first novel, PS. I Love You when she was twenty-one. It was published in 2004, the number 1 bestseller in Ireland for 19 weeks and sold in over forty countries. The book was adapted as a motion picture directed by Richard LaGravenese and starring Hilary Swank and Gerard Butler and released in 2007 in the United States.

Her second book, Where Rainbows End (US title: Love, Rosie or Rosie Dunne) won the German CORINE Award in 2005. She contributed with short stories to charity books and is also the co-creator and producer of the ABC comedy Samantha Who ?.