Love will be in the air for both of the bachelors on "Two and a Half Men" when CBS airs an all-new episode this Thursday.

In the upcoming episode, which is titled "West Side Story," Brooke D'Orsay will reprise her role as Walden's ex-girlfriend Kate and invite him to the grand opening of her boutique. Although their relationship was based on the lie that he told her about being a poor man named Sam, eventually their romance was able to evolve into something more, notes CarterMatt. Kimberly Williams-Paisley will also return as Alan's new love interest, Gretchen, on the April 3 episode.

CBS issued a press release and an official synopsis of the episode, which reads, "Walden gets an invitation to his ex-girlfriend's boutique opening. Meanwhile, Gretchen wants to spend more time at Alan's (a.k.a. Jeff Strongman) house."

In the video promo, Walden asks Kate out on a date and she agrees but firmly insists on "no sex." In the next clip, the two are seen getting hot and heavy as they make their way upstairs.

In the following episode on April 10, actress Mila Kunis will make her debut on the popular comedy series, marking the first time that she and her real life boyfriend Ashton Kutcher will appear together on television since they co-starred on "That '70s Show," reports The Hollywood Reporter. The two met back in 1998 on set at the Fox sitcom and have been dating for the last two years. They are now reportedly engaged and expecting a baby.

Kunis will play Vivian, a young, beautiful and free-spirited world traveler who shows up on Walden's doorstep. In turn, Walden, who was about to propose to someone else, will feel an instant connection with her and become convinced that she's the one, reports CBS News.

"Two and a Half Men" S11E18, "West Side Story," airs on Thursday, April 3 at 9 p.m. EST on CBS. Watch the promo below.