Courtney

From Two and a Half Men Wiki

Courtney is played by Jenny McCarthy) .

Charlie fell for his future stepsister, "Courtney", and after agreeing to stop seeing her due to their relationship to each other, he lends her a substantial amount of money and proposes moments before they become step-siblings. Charlie is heart-broken to learn that she is actually a con artist named Sylvia, but he apparently retains feelings for her, telling her that he will "wait" for her (to get out of prison).