By Jen Heger - Breaking Celebrity News Legal Editor

Brooke Mueller is in rehab, but is she taking it seriously?

Mueller checked into long term rehab to get the best possible deal in her cocaine possession case, and as soon as the matter has been resolved, it's very likely that she will immediately check out, Breaking Celebrity News is exclusively reporting.

Charlie Sheen's ex-wife was arrested on December 2 after allegedly assaulting another woman in an Aspen nightclub. Cops claim they found Mueller with cocaine in her possession.