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Just when you thought you couldn't be more excited about Disney's Moana [2], Dwayne Johnson [3] ups the ante with an adorable video. The actor took to Instagram on Monday to share a heartwarming clip of him and the film's songwriter, Lin-Manuel Miranda, singing the Beauty and the Beast hit "Gaston." Not only do the duo show off their impressive singing voices, but Johnson also flaunts his huge biceps [4] for the camera. The Hamilton star recently took over Disney Animation's Instagram to promote the upcoming film by covering some of Disney's most iconic tunes [5] including from Aladdin, Newsies, The Little Mermaid, and Mulan. See their amazing duet above, and then watch the trailer for the upcoming movie [6].