London, Aug 20 - Kerry Katona, former pop singer of the girl band Atomic Kitten, receives $3,400-a-month maintenance by her ex-husband for their two daughters but she skimmed the money to buy drugs.

Brian McFadden gives maintenance money to Katona for their kids -- Molly, 7, and Lilly Sue, 6, reported mirror.co.uk.

'All her assets have been frozen. So that regular payment from Brian, which is protected from the bankruptcy order, was a temptation she just couldn't resist,' said a source.

'She knew the money was untouchable. It goes towards the kids' school fees and clothing and feeding them. she hasn't been spending every penny of it on drugs but she's made no secret of the fact she's been skimming off the top for herself,' added the source.

Brian's cash goes to an auditor who passes it to Katona because the bankruptcy order puts restrictions on her bank account.