The former Spice Girl has a hint of Audrey Hepburn about her in the photoshoot, taken for Elle magazine's subscriber cover in the U.S.
But the 35-year-old has revealed that she is insecure and that her shyness is the reason for her near-constant pout.
Looking posh: Victoria Beckham reclines on a diving board wearing a belted zebra-print jacket, stocking and cream heels for the subscribers cover of Elle
She said: 'I do have my insecurities. Maybe that is why I look a little bit serious.
'The kind of person who's going to stand on the red carpet and love the attention and have the big grin - I'm just not like that.
The mother-of-three, speaking to Elle, said that her relationship with husband of 10 years David was as strong as ever.
Severe: The singer-turned-designer shows off her taste in cashion on the front cover of the October edition of U.S. Elle
'David and I have a working relationship together, and we also have a private life together.
'Someone used the example recently of Brad and Angelina. They might be in a movie together, but that doesn't mean they're going to let someone film them at home.
Despite her recently appearing as a guest judge on American Idol, she said reports that she wants an acting career are 'rubbish'.
'I know my boundaries - I know what I am good at and what I'm not good at.'
She also appears on the general on-sale cover, posing in a grey and yellow dress and carrying a silver box clutch.
The photoshoot and interview are well-timed.
Although celebrities including Elle Macpherson, Mel B and Katherine Jenkins have been snapping up her dresses, Victoria's denim line has been dropped by another US retailer.
According to reports, the dVb brand was dumped by high-end Los Angeles boutique Maxfield.
'Maxfield no longer carries dVb,' a source told a US newspaper, who cited 'poor sales' as the reason.
The line was previously dropped by Kitson, Saks and Bendels.
A representative for Victoria Beckham, 35, insisted: 'Maxfield has not carried any dVb product for the past three seasons.'