An A-OK Leto dons a coat of many colors for a walk around New York City. Plus: Mandy Moore, Seth Rogen & more!

SLAM 'DUNK'

Rita Ora feels the freeze on Monday as she joins other stars like Hugh Jackman and Britney Spears by accepting the ALS #IceBucketChallenge on the streets of N.Y.C. (Katie Holmes, Kate Upton, and Donna Karan, fill your buckets: the singer nominates you!)