Brooke Mueller has gone back to rehab, according to reports.

The socialite refused her drug test Friday, one that she was required to take as part of her custody settlement with ex-husband Charlie Sheen.

This followed a week in which she allegedly went off the rails. There’s no hard proof of her binging on drugs, but that pawn shop sighting is sketchy to say the least, and Sheen’s lawyers are going to court on Tuesday to raise the issue.

Sources say Brooke’s return to rehab is a preemptive strike.

A source close to Mueller tells E! News somewhat vaguely that: “Brooke is doing fine, she is

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