Moore made her feature film debut in 2001, where she voiced a Girl Bear Cub in the comedy "Dr. Dolittle 2," which starred Eddie Murphy. Later that year, Moore co-starred with Anne Hathaway in the comedy "The Princess Diaries," based on Meg Cabot's novel of the same name, and was released on August 3, 2001. She played Lana Thomas, the rival of Mia Thermopolis (Hathaway). On her role, Moore told "InStyle" Magazine, "I'm the crude popular girl who gets ice cream in her face." The film opened in 2,537 theaters in North America and grossed $22,862,269 in its opening weekend. It grossed $165,335,153 worldwide—$108,248,956 in North America and $57,086,197 in other territories. The film received mixed to positive reviews. Rotten Tomatoes reported that 47% of 113 sampled critics gave the film positive reviews and that it got a rating average of 5.2 out of 10. In the film, Moore performed a cover of Connie Francis's 1958 song "Stupid Cupid" while at a beach party.