Another One Drops The Ball: Sienna Miller On Board For 'New Year's Eve'

Are you sick of casting announcements for the ensemble rom-com "New Year's Eve"? Well, too bad—because the film just picked up another actor, and it's still only about two-thirds cast. The latest addition according to Variety: Sienna Miller, who we last saw decked to the military gills in the indecipherable action thriller "G.I. Joe."

Makes sense. After all that shooting and stabbing and stuff, she could probably use a nice, light comedy.

Sienna joins a fast-growing list of Hollywood Who's Whos attached to this movie, which also boasts the involvement—either rumored or confirmed—of Halle Berry, Zac Efron, Sarah Jessica Parker, Robert DeNiro, Lea Michele, Jessica Biel, Sofia Vergara, Ashton Kutcher, Michelle Pfeiffer and Hilary Swank.

...Yeah. Next time, it might just be easier to list all the actors who aren't going to be in this movie. Stick around for further casting announcements as they come in!

Will you make "New Year's Eve" plans with Sienna?