Washington, Sept 21 : Isla Fisher has signed on to star in "Confessions of a Shopaholic".

The Touchstone comedy will be directed by P.J. Hogan, and is based on the novels by Sophie Kinsella.

Kinsella is the pen name for Madeleine Wickham - a U.K.-based financial journalist.

Scripting the movie will be Tim Firth, reports the Hollywood Reporter.

The plot revolves around a compulsive shopper in Manhattan, played by Fisher, up to her neck in debt who ironically becomes a financial advice columnist.