Susan Boyle's upcoming documentary has been described as being shockingly honest and "real no holds barred stuff".
The programme is to be made by My Big Fat Gypsy Wedding director Osca Humphreys.
The show ill include footage of Boyle meeting Simon Cowell, working on her hew album Someone To Watch Over Me as well has throwing some diva tantrums.
A source told The Sun: "It's real no holds barred stuff and shows all sides of SuBo, including her grumpy moments.
"Even those close to Susan have been shocked at how honest the footage is."
They added: "Production company Firecracker brought back Osca Humphreys - the director of the original My Big Fat Gypsy Wedding show - to follow the singer around for the past three months. And he's captured some cracking footage."
The documentary will air next month shortly after the release of her thrird album.
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