The premiere of "The Dancing Cavalier" is a tremendous success. When the audience clamors for Lina to sing live, Don, Cosmo, and R.F. tell her to lip sync into a microphone while Kathy, concealed behind the curtain, sings into a second one. While Lina is "singing" ("Singin' in the Rain Reprise"), Don, Cosmo, and R.F. gleefully open the curtain, revealing the fakery. Lina flees in humiliation, and a distressed Kathy tries to run away as well, but Don proudly announces to the audience that she's "the real star" of the film ("You Are My Lucky Star"). Later, Kathy and Don kiss in front of a billboard for their new film, "Singin' in the Rain".