24. Kristin Chenoweth
The pint-sized powerhouse vocalist and actress proves big talent comes in small packages. The diva turned 50 on July 24 and recently finished leading the second season of NBC comedy Trial & Error. You can catch her reprising of her iconic role as Glinda in Wicked to host NBC's special, A Very Wicked Halloween: Celebrating 15 Years on Broadway, on October 29.