By Breaking Celebrity News Staff

Charlie Sheen's ex-wife Brooke Mueller has landed back in drug rehab, Breaking Celebrity News has confirmed.

“As part of her ongoing treatment and as planned," her rep Steve Honig said in a statement, "she voluntarily checked herself into a rehab facility several weeks ago.”

The 34-year-old mother of Sheen's twins, is seeking help for her well-documented addiction to crack cocaine, a source told Breaking Celebrity News.

Mueller has been in rehab more than 10 times, the source added, as she has unsuccessfully battled addiction for more than a decade.

Complicating the issue is that Brooke remains on probation in connection with a cocaine arrest in December after police found the drug in her possession following a spat with a woman in an Aspen night