Despite rolling out Justin Bieber acceptance speeches about his haters and his mom, Nicki Minaj in pink wig and fake snow, more Taylor Swift ring kissing, Christina Aguilera, Carly Rae Jepsen, Kelly Clarkson, Usher, Carrie Underwood, Ke$ha, Pink, Pitbull, Linkin Park, No Doubt and the triumphant return of MC Hammer in a “Gangman Style” dance-off with PSY, the “American Music Awards” suffered its smallest audience in its 40-year history Sunday night.