His career began at 3 years of age, participating in television commercials. His film debut was in the 2003 film School of Rock as Summer Hathaway alongside Jack Black, receiving positive reviews. Cosgrove earned $ 180,000 per episode she did in the Nickelodeon series iCarly, being the second highest paid actress in youth televisión.3 She belongs to the list of Guinness World Records 2012 for being the best paid child actress in iCarly. Their debut album Sparks Fly was released on April 27, 2010, debuting at # 8 on the Billboard 200. Miranda worked on the album with Espionage, Dr. Luke and The Matrix.