Born in Dublin, Ahern is now published in nearly fifty countries, and has sold over 25 million copies of her novels worldwide.

Her older sister, Georgina Ahern, is married to Nicky Byrne of Irish pop group Westlife.

The book was adapted as a motion picture directed by Richard LaGravenese and starring Hilary Swank and Gerard Butler.

[9] Her second book, Where Rainbows End (U.S. Love, Rosie), also reached number 1 in Ireland and the UK, and won the German CORINE Award in 2005.

[9] It was adapted as a motion picture titled Love, Rosie which was released in 2014, directed by Christian Ditter and starring Lily Collins and Sam Claflin.

She has contributed to charity books with the royalties from short stories such as Irish Girls are Back in Town and Ladies' Night.

starring Christina Applegate, Jean Smart, Jennifer Esposito, Barry Watson, Kevin Dunn, Melissa McCarthy and Tim Russ.