Brooke Mueller has returned to rehab after relapsing.

The former wife of Charlie Sheen - who is currently on probation after being arrested for cocaine Possession in December - checked herself into an undisclosed in-patient treatment facility a few weeks ago on the actor's advice, according to gossip website TMZ.

Brooke - who has struggled with substance abuse issues in the past - reportedly appeared ''out of it'' when she paid a recent visit to her ex-husband, with whom she has three-year-old twin sons Bob and Max so Charlie urged her to get help.

A source close to Brooke told Celebuzz, she ''partied for four days straight ... and ultimately fell off the wagon''.

The insider added: ''Brooke's family is hoping that she finally understands the consequences of her actions. That is, she risks losing all of her rights to the children if she doesn't get clean - once and for all.''

Brooke,34, is said to have missed Mother's Day with twins, Bob and Max, on May 13 while partying and her mother Moira Fiore was looking after the kids.

However, Brooke's representative Steve Honig claims her recent hospitalisation was planned.

He said: ''As part of her ongoing treatment and as planned, she voluntarily checked herself into a rehab facility several weeks ago.''