As of May 2010, Cosgrove earned 0,000 per episode of i Carly, making her the second-highest-paid child star on television, and in 2012 was listed in the Guinness World Records as the highest paid child actress.Cosgrove also voiced Margo in the animated film Despicable Me (2010) and its 2013 sequel.That year, Cosgrove was cast in an NBC television pilot titled Girlfriend in a Coma, which didn't materialize after Christina Ricci left the production.In 2016, she starred on the short-lived NBC sitcom Crowded.She appeared in a number of minor television roles over several years before coming to prominence as Megan Parker on the Nickelodeon television series Drake & Josh.In 2007, she landed the role of Carly Shay, the lead character on the Nickelodeon teen sitcom i Carly, on which she starred until 2012.In the movie, she played Summer Hathaway, a young girl with great ambition and discipline who finds herself adjusting to the free-spirited nature of the new teacher by becoming band manager of the classroom's rock band.
, as well as guest-starring in a season five episode of Grounded For Life, portraying the character of Jessica.Cosgrove's debut studio album, Sparks Fly, was released in April 2010, followed by her second extended play, High Maintenance, the following year.The EP's lead single, "Dancing Crazy", written by Avril Lavigne, debuted at number 40 on the US Billboard Adult Pop Songs and peaked at number 100 on the Billboard Hot 100.The tour began in Missouri and travel throughout the United States and ended in Ohio.
Cosgrove continued the tour into the summer to promote her second EP, High Maintenance.
Cosgrove was also rewarded her second major role in a theatrical film, when she cast alongside Drake & Josh co-star Drake Bell in the comedy film Yours, Mine and Ours, in which she portrayed the character Joni; She also earned a role in the straight-to-DVD film The Wild Stallion and appearing in several Nickelodeon television series. Cosgrove later guest starred on an episode of Unfabulous, which starred Emma Roberts.