'Two and Half Men' fans know the blonde and bubbly Kelly Stables as Alan's receptionist-slash-girlfriend, Melissa. Starting Monday, though, Stables hops networks for the premiere of the new ABC sitcom 'Romantically Challenged,' playing Alyssa Milano's randy sister, Lisa, a kindergarten teacher by day and supposed sex kitten by night. PopEater caught up with Kelly, who dished about her new gig -- as well as the future of 'Two and a Half Men' now that her co-star, Charlie Sheen, is looking to move on from the show. She also opines about her fantasy musical-theater ending for the much-loved comedy.