In the 2011 film New Year's Eve, which actor directed the ensemble romantic comedy?

Garry Marshall directed the 2011 film New Year's Eve.

The film is an ensemble romantic comedy set in New York City during the final hours of one year and the first hours of the next. Its interconnected stories follow characters dealing with relationships, family, work, regret, and new beginnings while the city prepares for the Times Square celebration.

Marshall had already directed the similarly structured holiday film Valentine's Day, released in 2010. New Year's Eve uses a large cast that includes Ashton Kutcher, Katherine Heigl, Sarah Jessica Parker, Michelle Pfeiffer, Hilary Swank, Robert De Niro, and Halle Berry.

The movie was written by Katherine Fugate, who also wrote Valentine's Day. The title can be confused with films and songs using the same phrase, but this question refers specifically to the 2011 American feature film directed by Marshall.