Peaches Geldof has apologised for Tweeting the names of two mothers who allowed Lostprophets rock star Ian Watkins to abuse their children.
Peaches, daughter of Boomtown Rats singer Bob, is facing a criminal investigation for tweeting the names that may identify Watkins' victims.
A court order was made to grant lifelong anonymity to the two children but Peaches broke the order by naming their mothers to her 161,000 followers on Twitter.
The Attorney General said a possible criminal offence had been committed and South Wales Police are investigating.
But this morning, ahead of the investigation, Peaches posted a string of Tweets to justify what she'd done and to apologise, before signing off: "Lesson learned."
She wrote: "For all of those out there tweeting me about naming the paedophile mothers involved in the Ian Watkins case, the names have been in the public domain since December 12th when the court named them and put them up on their website for all to see.
"Half of twitter had tweeted out the names also aside from my (now deleted) tweet.
"The babies will most probably be given new identities to protect them from future abuse from other paedos who know who they are/ their names from the videos Watkins uploaded to Paedo websites.
"The question of whether or not to give anonymity to criminals in cases like this will go on forever.
"However these women and Watkins will be getting three meals a day, a double bed, cable TV etc all funded by the tax payer alongside not being named apparently. It makes me sad.
"I deleted my tweets however and apologise for any offence caused as at the time of tweeting had only seen everyone tweeting the names at me so had assumed as they were also up on news websites and the crown courts public file that they had been released for public knowledge.
"Will check my facts before tweeting next time. apologies and lesson learned."
Lostprophets singer Watkins was branded a 'determined and committed paedophile' after he pleaded guilty on Tuesday to a string of sex offences, including the attempted rape of a baby.
The 36-year-old, from Pontypridd, South Wales, plotted the abuse with the two mothers in text and internet messages.
Outraged at the fact mainstream media had not named the women involved, mum-of-two Peaches, 24, told her followers: "The papers MUST name 'woman A & B' who offered up their babies to this monster."
When newspapers didn't - for legal reasons - she decided to publish the banned details herself, after reportedly reading them on a US-based website."
She tweeted: "The names are..." and wrote both mothers' full names, before adding: "what sick, horrible women."
Following Peaches' now-deleted Tweets, a spokesman for Attorney General Dominic Grieve said: "We understand that the names of the co-defendants in the Ian Watkins case were posted online but have now been removed.
"As has been previously reported, the co-defendants were the mothers of the victims.
"Victims of sexual offences have automatic lifetime anonymity and the publication of names or information which can lead to their being identified is a criminal offence. This is a police matter."
Detective Chief Inspector Peter Doyle, of South Wales Police, said: "We are currently in consultation with the Crown Prosecution Service regarding the matter and will take action if appropriate."