Charlie Sheen and Brooke Mueller Go Bananas In Mexico

Brutal divorce? Bitter custody battle? Multiple trips to rehab? It was all water under the bridge this weekend as Charlie Sheen and Brooke Mueller yucked it up in Mexico.

As TMZ first reported, Charlie decided to whisk Brooke south of the border as a reward for how well he thinks she's been doing with rehab ... and to celebrate her birthday.

Is this a precursor to another walk down the aisle?