Alex Pettyfer was born in Stevenage, Hertfordshire, England, the son of Lee Robinson (married names Pettyfer, Ireland and Young), an actress and Richard Pettyfer, an actor. Both parents met while performing in London's West End in West Side Story, Cats and Miss Saigon. He has a younger half-brother, James Ireland, a professional tennis player and regional coach, from his mother's remarriage to Michael J. Ireland, a retired builder and property developer. Pettyfer was brought up in Esher and then Windsor, Berkshire and began his career initially being managed by his mother as a child fashion model at the age of seven, for Gap, after meeting Ralph Lauren in a toy store in New York. He also did advertisements for some yogurt brands. His first commercial was at age six.

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