With Chelsea moving in with Charlie on this week's Two and a Half Men, things were actually looking good for the bachelor's longest running relationship.  But leave it to Chuck Lorre and company to throw in a beautiful wrench.

According to TV Guide, the beautiful ballet teacher, Mia (Emmanuelle Vaugier), will return for the May 18 Two and a Half Men season finale.  Expect Mia to completely screw up  Charlie's relationship with Chelsea.

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