He made a last-minute change of plea before his trial started at Cardiff Crown Court in Wales on Tuesday, sparing the jury from seeing what the judge called "extremely graphic and distressing" video footage.

He will be sentenced on December 18.

"Ian Watkins was the lead singer of a successful band called the Lostprophets," prosecutor Christopher Clee told the court.

"He was also a determined and committed paedophile engaged in serious sex offences involving two babies."

Watkins plotted the abuse of a one-year-old child in messages with the mother, including one in which he said he wanted a "summer of filthy child porn" and to take things "to the next level".

He then recorded camcorder footage of himself performing a sex act on the child during a drug-fuelled binge, after arranging to meet the child's mother in a London hotel room.

Police found the footage uploaded to an online storage drive.

Watkins then persuaded another female fan over the Skype network to abuse her own child. The split screen footage shows him referring to the woman and her baby as his "slave duo".

They also discuss making the child have sex with animals and take drugs as it grows up.

A laptop seized from Watkins' home had to be cracked by the British government's electronic eavesdropping system GCHQ.

Watkins was originally charged with rape but insisted sex with the child did not happen.

He pleaded guilty to 11 charges on Tuesday, including attempted baby rape and others involving possessing and making images of sexual abuse and conspiracy to rape.

One of the women admitted six offences and the other woman admitted seven offences.

Lostprophets, who formed in 1997 and had a string of gold and platinum albums in the US and Britain, disbanded this year after Watkins was charged.