Katherine Heigl had assistance with her umbrella this morning on the NYC set of New Year's Eve. The actress is the latest to join the star-studded cast that includes Zac Efron, Sienna Miller, and Jessica Biel. Katherine took over a part that originally belonged to Halle Berry, who dropped out to focus her attentions on her battle for custody of her daughter, Nahla, with ex Gabriel Aubry. One of Katherine's other costars in the comedy, Ashton Kutcher, has been lucky to escape the cold temperatures — he's been working on his tan and enjoying a Brazilian vacation with Demi Moore. The Garry Marshall-directed movie will reunite Killers leading man and woman Ashton and Katherine, and hopefully their second big-screen effort will fare better critically than the first.