This Thursday, "Two and a Half Men" will air its last episode of the season, which promises to go out with a bang as Alan and Gretchen prepare to officially tie the knot.

In the last episode, Alan proposed to his girlfriend Gretchen.

In the season 11 finale, entitled "Oh, Wald-E, Good Times Ahead," Alan will finally come clean about his alter ego, "Jeff Strongman." He will confess to Larry that he used to be with Larry's now-fiancée, Lyndsey, and that she has cheated on him a number of times with Alan since they got together.  He will also tell Larry that he made up the identity to scope him out because he wanted to see why Lyndsey chose Larry over him. In response, Larry's reaction will not be good, reports TV Guide.

Kimberly Williams Paisley will return as Gretchen in the upcoming episode, however, her real-life husband, country singer Brad Paisley, will also make a guest appearance. Meanwhile, Walden will deal with his commitment issues and decide if he wants to be with Kate.

Details about the "Beat This Summer" singer's role on the comedy series have not been disclosed. There is speculation, however, that he will pose a threat to Alan and Gretchen's relationship  in the final episode. Given Alan's misfortune, it's safe to bet that Paisley's appearance will stir things up in his love life.

According to CBS, the synopsis for Season 11 finale "Oh, Wald-E, Good Times Ahead," states that: "Alan confesses his true identity to Larry and has to face the consequences -- good and bad."

"Two and a Half Men" S11E22, "Oh, Wald-E, Good Times Ahead," airs on Thursday, May at 9 p.m. EDT on CBS.

Watch the trailer video below.