Learn more about your favorite celebrity's superstitions! Heidi Klum br always keeps her baby teeth close by. Taylor Swift br used to write '13' on her hand before every performance. Ariana Grande br used to munch on donuts before big auditions. Megan Fox br always listens to Britney Spears music on plane rides. Michael Jordan br wore his college shorts under his NBA uniform for most of his career. Matt Lauer br arrives in his dressing room at the same time to the minute, every day. Christian Bale br deliberately walks under ladders.