Kidman's films were estimated to only earn 1 dollar for every dollar the Oscar-winning actress was paid compared with US$8 a year ago.

"The Invasion," a remake of the 1956 classic "Invasion of the Body Snatchers," even lost US$2.68 for every dollar earned by Kidman who was reportedly paid US$17 million for her role.

"Despite winning an Oscar for her performance in 2002's "The Hours," Kidman has become the most overpaid celebrity in Hollywood," said Forbes, adding that her upcoming movie "Australia" could give her a boost.

Second in the list came Jennifer Garner, whose movies including "The Kingdom" and "Catch and Release" have underperformed at the box office. Her movies were calculated to earn 3.60 dollars for every 1 dollar she was paid.

Kidman's ex-husband, Tom Cruise, came third in the list with a US$4 return for every dollar he was paid, mostly because of the failure of last year's movie "Lions for Lambs." For every dollar the star earned the film returned only US$1.88.

Forbes said the ranking was compiled by looking at a star's past three movies and dividing their total earnings by the films' gross income to get the actor's payback figure.

Making up the top 10 of overpaid Hollywood celebrities were Cameron Diaz, Jim Carrey, Nicolas Cage, Drew Barrymore, Will Ferrell and Cate Blanchett.

The actor whose bankability improved most over the past year was Crowe, who was ranked the most overpaid celebrity last year when Kidman was in second place.

Last year, Forbes estimated the movie "Cinderella Man" earned US$5 for every dollar that Crowe was paid.

But this year, he was the 18th best earner on a previously issued list of which actors were worth their paychecks, with a return of 6.88 for every dollar he earned.

This bump was attributed to last year's movie "American Gangster" with Denzel Washington, for which Crowe returned a healthy US$10.80 for every dollar he was paid.