Christian Bale: 'Untitled David O. Russell Project' Star!

Christian Bale dons a bunny rabbit cap while stepping out with his wife Sibi Blazic on Saturday (October 6) in Brentwood, Calif.

The 38-year-old actor and his wife were spotted taking their adorable daughter to a birthday party.

PHOTOS: Check out the latest pics of Christian Bale

It was recently announced that Christian will join talented actors Bradley Cooper, Jeremy Renner, and Amy Adams on The Untitled David O. Russell Project.

The film is tentatively set for a late 2013 release, and will start production on the East Coast in mid February.

FYI: Christian is wearing Skechers GOrun sneakers.