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This picture shows a girl believed to be just four years old holding a line of cocaine and a rolled-up note and was taken by disgraced former LostProphets singer Ian Watkins.

The paedophile sent Jo Mjadzelics the picture, taken in his bedroom, in 2008 and she says she took it to the police.

But it was another five years before the disgraced rock star ended up in jail.

In the meantime, he abused a string of children.

His former lover Mjadzelics, 38, said: “If this picture did not prove he was a danger to children then I don’t know what would have.”

She said she believed Watkins was joking when he told her of his sick fantasies about abusing children and babies.

But when the Lostprophets star sent her this photograph she realised he was serious about his vile intentions.

The 38-year-old took the snap straight to police and social services after she received it in 2008, but claimed they ignored her – allowing the paedophile to continue his appalling sex attacks on children and babies.

In December he was locked up for 29 years and ordered to serve at least 19 for his disgusting campaign of abuse.

But Jo, who is the semi-naked woman pictured on the frame the girl is holding, claimed the 36-year-old could have been brought to justice sooner after she showed the authorities the snap.

The girl in the picture has been digitally altered to make her unrecognisable.

She said: “This was the picture that made me believe Ian’s interest in children was real and not some sick fantasy. The moment he sent them to me I knew he was a danger to children and went straight to the police and social services. But no one ever believed me.

“At first I was just disturbed by Ian when he said he wanted to abuse children. I thought it was some twisted joke, but when he emailed me this pic I realised he really meant it. I was sickened. I knew I had to act and I thought this picture would be enough for them to investigate but they refused. If this picture does not prove he was a danger to children then I really don’t know what else would have. Instead they ignored me for four years and we know what happened next.”

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Jo told how she sent Watkins the photo of herself in bra and pants as a present after he asked her how he could snort cocaine from her bum when they were apart. A razor blade can also be seen resting on the framed snap the girl is holding.

She added: “This was the point where he had crossed the line.

“It was so clear to see, anyone in their right minds could see this was not some rocker indulging himself, this was a scary man who was becoming a sinister threat to kids.

“Seeing myself on the pic was so upsetting because I thought it was just a silly joke but now it looked so evil.”

Jo told how she took the photo to police and social services in Pontypridd, where Watkins’ family lived.

Her claims that she was ignored are being dealt with by the Independent Police Complaints Commission which is due to report back later this year.

Rhondda Cynon Taf council social services say they did take action “in line with agreed procedures” following Jo’s report to them in December 2008.

But they refused to comment on claims they were repeatedly contacted, and have declined to say if any review into their actions is taking place.

Watkins, who once dated stars like Fearne Cotton and Alexa Chung, was arrested in October 2012.

He was jailed at Cardiff crown court after admitting a string of charges including the attempted rape and sexual assault of a child under 13, conspiracy to rape and taking, making or possessing indecent images of youngsters.

The beast has never shown any remorse for his actions. He even described his sick crimes as “Mega Lolz” in a recorded phone call from his prison cell before he was sentenced last year.

Trial judge Mr Justice Royce told Watkins: “The public and, in particular, young females need protection from you.”

It is believed the star may have victims across the world and police are investigating leads in the US and Germany. The two mums of the children he abused, known as Woman A and Woman B, were jailed for 14 and 17 years. Last month, The Mirror revealed Watkins was recently moved to Long Lartin prison in ­Worcestershire from Wakefield so he could be closer to mum Elaine, who is ill after having a kidney transplant. He is appealing against the length of his jail term.

Jo, from Doncaster, has previously revealed the rocker boasted of his plans to rape a two-year-old child. And he allegedly confided in her of how he would use the children of “Superfans” to fulfil his depraved desires.