Simon Cowell has seen his fortune rise by more than £40 million – leapfrogging the Beckhams, a new rich list reveals.

The star – who rakes in masses from his TV shows and the acts he has signed via The X Factor – is now estimated to be worth £165 million.

Big successes in the past year have included Britain’s Got Talent star Susan Boyle, who became a worldwide hit.

David and Victoria Beckham are now reckoned to be worth £145 million, according to the Sunday Times Rich List 2010 to be published this weekend.

Simon is now ranked 11th in the list of top music millionaires, up from last year’s 15 thanks to a 38 per cent rise in his assets.

The Beckhams saw their fortune swell by £20 million, helped by Victoria’s success as a fashion designer and her husband’s sponsorship deals, although they remain in 14th spot.

Simon still has a long way to catch up with fellow music and media mogul Simon Fuller – who has guided the Beckhams’ careers – who has launched another new company XIX in recent months.

He is valued at £350 million, up £50 million in a year, and ranked sixth.

Impresario Sir Cameron Mackintosh has seen the most dramatic rise in the music millionaire list, shooting up £285 million in the past 12 months, although this is largely due to a major revaluation of his business assets. These include licensing, performance rights and a London theatre chain.

His friend Lord Andrew Lloyd-Webber is ranked one place higher at number three.

The composer and theatre boss was actually pushed from last year’s number two spot and his wealth has slipped by £50 million to £700 million, according to compilers of the list.