THE BIG BANG THEORY star Kaley Cuoco has signed on to the live-action/CG feature, I HOP, according to THE HOLLYWOOD REPORTER. ALVIN AND THE CHIPMUNKS helmer Tim Hill is directing the Illumination Ent. and Universal Pictures production. Cuoco will play the sister of a slacker (James Marsden) who accidentally injures the Easter Bunny’s son, voiced by Russell Brand.