Kaley Cuoco and Johnny Galecki met up with their costars from The Big Bang Theory yesterday for a night of laughs and charity at the A Night at Sardi's gala in Beverly Hills. Kaley wore a strapless blue gown as she mingled with stars like Emmy Rossum, Jason Bateman, and Zachary Levi at the event. She got glammed up after sporting a more casual, but still chic, look when she celebrated Hollywood stylists at an event in LA last week. The Big Bang Theory cast and other funny actors and actresses typically perform skits during the event, which benefits the Alzheimer's Association. We were live on the scene last night, so be sure to check back for more of our red carpet coverage!