Beverly Hills Brooke Mueller western hippie Charlie Sheen

She's just completed a two-month stay in a rehabilitation center, and Brooke Mueller looks happy, healthy and ready to make a fresh start!

Charlie Sheen's ex-wife channeled her inner hippie in a leather vest, matching hat, oversized belt and layers of turquoise as she stepped out for lunch in Beverly Hills, on Friday afternoon.

Mueller entered rehab in May to seek treatment for substance abuse, but now the mother-of-two is focused on her sobriety, and also has a sober living companion that will be staying with her to ensure that she sticks to her healthy new plan.

Brooke even teared-up at the mention of ex Charlie Sheen's assistant, Rick Calamaro, who died this week. She calls it a "warning" for those with substance abuse issues ...