Demi Moore has been placed in "detox" in her rehab clinic
The 49-year-old actress has entered into treatment for "substance abuse and anorexia" at Cirque Lodge in Utah - which has previously treated stars including Lindsay Lohan, Mary-Kate Olsen and Eva Mendes - but has not yet had any interaction with other patients.
A source told RadarOnline.com: "She hasn`t had any interaction with other patients yet. She is still in detox at the moment."
Charlie Sheen`s ex-wife Brooke Mueller is also receiving treatment at the clinic and is said to be doing well as she tackles her drug addiction.
The source added: "Brooke is doing very well in rehab, this is the first time she has been in residential treatment, and it`s been a very positive experience for her so far. Brooke will be at the facility for approximately 35-45 days in total.
"Brooke hasn`t talked to or seen Demi. This is simply because they are in different stages in treatment."
Demi - who was rushed to hospital last month after suffering a seizure at a party - is expected to stay at Cirque Lodge for 30 days, while Brooke is due to leave the facility at the end of this month.
Last week, Demi`s three daughters, Scout, 20, Tallulah, 16, and 23-year-old Rumer, as well as ex-husband Bruce Willis, were said to have encouraged the `Striptease` star - who split from second spouse Ashton Kutcher in November - to seek professional help, but she reportedly refused to go to rehab.