For her first AMAs performance in 16 years, Shania Twain closed the American Music Awards show with a medley of her greatest hits mixed with lines from Post Malone, Twenty One Pilots, Drake and Taylor Swift, before transitioning into a colorful, over-the-top performance of "That Don't Impress Me Much" and "Man! I Feel Like a Woman!" EVERYONE was into it, but maybe not as much as Post Malone. He's clearly a Shania Twain Stan and we are all here for it!