When Chelsea moves in, Berta informs Charlie that she now works for Chelsea and he can direct his requests through her.
Charlie walks into Chelsea's old apartment only to find out she was packed and ready to move before he even invited her to move in.
Charlie hands Chelsea over Alan's set of house keys when he asks her to move into his former bachelor pad in Malibu Beach.

Two and a Half Men Season 6 Episode 22 Quotes

Chelsea: I just think it's ridiculous that we're engaged and we're not living together
Charlie: Well excuse me for being old fashioned. I'm just not comfortable with us living in sin
Chelsea: So you think we should stop having sex?
Charlie: No no, it's not the sin I object to, it's the living in it

Berta: Okay you and me need to talk
Charlie: I know I know. you didn't sign up for this. You work for me, not for her, and it's bad enough you have to put up with zippy and the chip
Berta: No, I like her better than you so for now on I'm working for her
Charlie: What?
Berta: You need something? You ask her, she talks to me, we decide
Charlie: I don't get vote?
Berta: Yeah, you get a vote. One vote our of three. Good luck with that