Shes looking thinner than ever, but theres one part of Victoria Beckham that looks set to put on a lot of weight very quickly - her wallet. Posh Spice has landed a 3million contract on American Idol, replacing Paula Abdul, but bosses of the hit show are still worried about her image. The 35-year-old has been given the stamp of approval by judge Simon Cowell and the maker of the show, Simon Fuller. But channel executives at Fox are concerned her skinny frame and British accent may put off US viewers. Mrs Beckham was only due to sit in as a guest judge for one episode of the talent search show. After her experience, she admitted she was incredibly nervous and said 'I know how it feels to stand there and be judged.But she has since attended two rounds of auditions in Boston - making her position on the judging panel more likely. Although fears over her tiny figure and distinctive British twang could scupper her chances of becoming a permanent fixture on the show. 'American Idol is the highest rated show and they dont want to pick a judge viewers dont take to. 'Focus groups are going to be set up to judge Victorias performance, a source told the News of the World. 'Theres some concern about whether viewers will think shes too skinny. DM 'Theyre also worried about her accent. Shes started to talk in a very posh voice and some people might struggle with that. Posh is not the only guest judge to appear on the show since Paula Abdul quit over a pay dispute last month. 'Victoria is the clear favourite because of Simon Fullers influence... She was a revelation at the second audition and is now top of the list to permanently replace Paula, added the source. Victorias spokesperson said the mother-of-three turned designer is focusing on New York Fashion Week to promote her clothing range, rather than her TV appearances. Although she may not have to do much promoting in that area. Supermodel Elle McPherson has recently been snapped in two dresses from Poshs collection, while opera singer Katherine Jenkins has also stepped out in a Beckham creation.