After her huge success with "Thoroughly Modern Millie," Sutton Foster went on to star in a string of other successful Broadway musicals. In 2005, she played Jo March in a musical adaptation of the novel "Little Women." Then, in 2006, she was the flamboyant singer Janet Van De Graaff in "The Drowsy Chaperone." In 2007, she took on the role of Inga in "Young Frankenstein," a musical adaptation of the film. One year later, she played Princess Fiona, the princess-turned-ogre, in "Shrek the Musical." She received a Tony nomination for each of the performances, apart from "Young Frankenstein." 

Foster was quickly becoming one of the best-known actors on Broadway, but she never took her success for granted. "I'm ... aware that I used to be a 14-year-old girl dreaming of this, so I never take it for granted," she told Broadway.com in 2005. "I cannot believe that I get to walk into a stage door in New York and do what I love to do every night."

Even though Foster later went on to work in TV, her years on Broadway remained a highlight of her career. "There's nothing like that live experience ... But Broadway and performing live in the theater is my true love," she later told Elle.