Celebrities Who Swear by Spanx

"SPANX. It's my dream come true," "30 Rock" star Tina Fey told "The Today Show" in 2010. Shown here is the Emmy-nominated actress and writer at the 2012 Museum of Natural History Gala at American Museum of Natural History on Nov. 15, 2012, in New York City. (Dave Kotinsky/Getty Images)