Courtney Thorne-Smith is set to reprise her role on CBS? Two and a Half Men in the highly anticipated ninth season. Thorne-Smith plays Lyndsey McElroy, a love interest for Jon Cryer? s character Alan Harper. Lyndsey was introduced at the end of the seventh season last year, with Alan landing a model-esque ideal woman instead of Charlie. Thorne-Smith continued on the show through last fall. Thorne-Smith? s last episode was in January, after Alan became convinced Lyndsey was secretly dating Charlie reports EW.