Stars Play 'Guess That Celeb' & More at Globes

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Hollywood's biggest names were in a playful mood on the Golden Globes red carpet on Sunday night, indulging ET's Nancy O'Dell and Rob Marciano in a few couple rounds of 'Guess That Celeb' as well as making up some fun drinking games for the viewers at home.

Click the video to watch Nancy and Rob try to stump the celebs with young pictures of their fellow nominees, and hear Kaley Cuoco's active drinking game for the show -- for pros only!

VIDEO: Best Golden Globe Award Zingers