Posh scores a gloriously executed goal against A-List opposition

But even the 33-year-old Spice Girl can not have imagined she would jump straight to the top of Tinseltown's celebrity ladder - and all, as The Mail on Sunday can reveal, because of a dress.

Posh chose to accompany her husband to his official unveiling as an LA Galaxy player in one of the most desired items on the planet - the Moon Dress.

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Envied: Victoria Beckham models Roland Mouret's coveted Moon Dress

Coveted by the likes of Nicole Richie, Sienna Miller and Nicole Kidman, the £990 origami-folded stretch cotton frock has been designed by Roland Mouret, whose Galaxy Dress became the hottest item of 2005.

Posh posed for photographers at the team's ground in Carson, California, on Friday with a £10,000 Barbie- pink ostrich-skin Hermäs Birkin bag on her arm, Balenciaga court shoes and her trademark oversized sunglasses.

Having worn the dress long before it goes on sale in November - and in the pink limited edition which will be sold only in upmarket New York department store Bergdorf Goodman - Posh is sure to have made shoppers from Sloane Street to Sunset Boulevard green with envy.

It is, to use her husband's terminology, a gloriously executed goal against the fashion opposition. And to guarantee she's one step ahead of every other red carpet hopeful, Posh has put her name down for all 21 items in Mouret's new collection - an order worth more than £30,000.

The RM range is the first to be shown by Mouret since he lost the right to design under his own name after a legal fight with backers over "artistic differences".

It will be released by the company 19RM, formed in collaboration with the media and entertainment tycoon, Simon Fuller, the former Spice Girls manager who also happens to manage David and Victoria Beckham.

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Victoria: 'flattered' by the huge welcome she'd received

The LA press pack swarm around the couple after their arrival

After showing off the collection to rapturous applause last week at the Museum of Architecture in Paris, Mouret said: "I will never forget the Galaxy. I love it and the opportunities it gave me, but I wanted to create a new feminine shape.

"I want to celebrate women with this collection - they are my greatest source of inspiration."

On Friday night, Posh appeared on the popular Jay Leno show, wearing a cream top and grey skirt from the RM range.

She said she was "flattered" by the huge welcome she'd received.