The 47-year-old actor's four-year-old twins, Bob and Max, were taken away after the Children and Family Services decided that Mueller's home has an "unsafe environment" for the kids due to her suspected drug use, reported Contactmusic.
Mueller voluntarily admitted to the UCLA Medical Center to receive treatment for prescription drug abuse. Her children have been placed with Sheen's second ex-wife Denise Richards.
"Brooke is currently at UCLA Medical Center where she has been since being admitted May 3. Brooke will be there for several more days, and will likely transition directly into a residential treatment facility to get help for prescription drug abuse.