Brooke Mueller Found New Boyfriend Through Charlie Sheen

Sources close to Brooke tell TMZ ... she and her new man -- country singer Jason Lowenstein -- met last year at a party WHILE Brooke was in the process of reconciling with everyone's favorite warlock.

We're told ... if Brooke hadn't been with Charlie at the time, she would not have been at that party and never would have met Jason. Our sources says the two exchanged numbers that night (don't worry, everything was kept PG) but Brooke had a sneaking suspicion the whole C.S. relationship wasn't going to work out (um, duh).