Brooke Mueller is set to appear in court in Los Angeles today in relation to "inconsistencies" about her drug treatment.

The 36-year-old socialite, who lost custody of her and Charlie Sheen's four-year-old twins, Max and Bob, in May after she was placed under an involuntary psychiatric hold in hospital before she agreed to return to rehab, was due to get her sons back before the end of the year but the plans are now on ice because officials have received new information suggesting she didn't tell them the whole truth about her treatment.

"Information has been given to the Department of Children and Family Services regarding Brooke's treatment that contradicts what she had told social workers. Naturally, the information has to be fully investigated given that Brooke has been to rehab more than 20 times and there are two minor children involved," a source said.

The boys are currently being cared for by Brooke's brother, Scott Mueller, but were previously being looked after by Charlie's other ex-wife Denise Richards. The new information will be formally submitted to the judge overseeing the case on Thursday and the source revealed if it substantiated as true, it would be "absolutely shocking."