One of the world's biggest pop stars is back with a brand new music video in which she plays the “world’s worst birthday party entertainers,” including “Goldie,” an aging Vegas lounge singer, “Yosef Shulem,” a Jewish bar mitzvah emcee, “Kriss,” an alcoholic clown, “Ace,” a redneck animal trainer and “Princess Mandee,” the birthday princess.

Can you guess who it is?