Charlie Sheen's ex-wife Mueller is undergoing treatment for drug addiction at The Betty Ford Center in Rancho Mirage, California, where Lohan is currently housed on court order, reported Daily Telegraph.
"Brooke is using every opportunity to reach out to Lindsay, who attends the same nightly meeting with her. Brooke is extremely eager to become besties with Lindsay while in rehab, and has told Lindsay how much they have in common," a source said.
Mueller, 35, shares two children with Sheen and they are currently with the actor's former wife Denise Richards.