AMY ADAMS
When Amy Adams stopped by The Late Show With David Letterman early last year, her appearance helped me realize just why she's so much fun to watch: In her interview, she reminisced fondly about her days in Minnesota doing dinner theater or, as she called it, ''skits 'n' grits'' and even showed off photos of her in a pig costume for a performance of State Fair. Clearly, this is a woman who will go to great lengths to entertain an audience, whether it be with her delightful, happy-to-be-here spirit (on display in Junebug, Enchanted, and Sunshine Cleaning) or her serious dramatic chops (in Doubt). Dawnie Walton
Image Credit: Bryan Bedder/Getty Images
The second part in our series, running down the performers -- like George Clooney, Amy Adams, and Steve Carell -- who make movies or TV shows better just by being in them