At the MTV Video Music Awards (Aug. 28), Lady Gaga transformed into her badass greaser alter ego, Joe Calderone. She totally committed to her show-opening act, talking in a tough voice and delivering a pretty convincing monologue before launching into song. Gaga committed to her alter ego all night--even accepting her VMA as Joe Calderone. But Gaga's not the only one with a famous alter ego. Backstage at the VMAs, rapper Nicki Minaj ...