Last night on Jimmy Kimmel Live, Scarlett Johansson accepted the late-blooming late-night host's invitation to prom, and posed for some loving photos with a cardboard cutout of a high school Kimmel. Plus: Chloë Moretz still regrets having complimented Johnny Depp not on his acting chops and inspiration but on his necklaces; Lena Dunham pegged Stephen Colbert — an admitted Charlotte from Girls' frontrunner Sex and the City — for Shoshanna. "You're a Juicy sweatshirt-wearing, self-help-loving girl from Long Island," diagnosed Dunham. Colbert quipped right back, shaking his finger, "You've been reading my diary." Also, Katharine McPhee recalled her "chubby and cheerful" days on American Idol. Watch our compilation to see what you missed.