POSH and Becks are fuming after a shocking TV documentary aired untold secrets about the couple, which could ruin their future success in the US.

Friends of the couple told the UK magazine Daily Star Victoria and David Beckham have been "betrayed" by former friends, lovers, business aides and old school chums in the hour-long program.

A source close to the couple told the Daily Star Sunday: "They are spitting blood. They feel they've been stitched-up betrayed, even. This couldn't have come at a worse time, with both of them trying to build new careers and reputations in Los Angeles. They have come under criticism from some observers in the States recently but public opinion is still good.  Depending on the exact content of this documentary, that could change.

Cable network E! Entertainment's True Hollywood Story: Posh And Becks tells tales never before heard in the USA.

And it's all finished off by their unofficial biographer Andrew Morton slamming them for engineering publicity which has often rebounded, plunging them into the dark side of celebrity.

Posh is said to be painfully embarrassed by the documentary dwelling on her husband's alleged affair with his personal assistant Rebecca Loos in Spain when he played for Real Madrid.

She is certain to cringe over an interview filmed before the Spice Girls recent reunion, in which she admits: "I never actually did that much other than wear the nice clothes and pout, so it wasn't that demanding being Posh Spice, to be honest.''

And the Beckham's wedding, at which they wore crowns and received guests while sitting on giant thrones is openly mocked.

The source added: "They are furious over the way it makes them look.

"She is portrayed as controlling while he will come across to a US audience as being weak."

Early in the documentary, Posh's old school pal Sarah Collyer recalls how she and other girls laughed when Victoria told them she had answered an ad to audition for a band, adding: "I thought, oh yeah, that'll last five minutes."

At the Laine Theatre Arts School in Epsom, Surrey, other girls taunted her because she was shy and was driven to school by her relatively well-off parents.

And one teacher would yell at her: "You're too fat, youre too spotty, your hairs a mess and you havent got enough make-up on.

Victoria's first love Mark, who she dumped after becoming a Spice Girl, says: "Victoria didn't really eat anything other than crisps, carrots and apples and drink loads of water.

It claims Posh exerted a powerful control over Becks, insisting they move into swanky Beckingham Palace in Hertfordshire.

He was left with a daily 400-mile round trip to train with United, which strained his father and son relationship with manager Sir Alex to breaking point.

The result was the famous dressing room shoe-kicking incident, in which sir Alex cut Beckham above the eye.

Shortly afterwards, he was transferred to Real Madrid.