Her second studio album, Under My Skin, was released in May 2004 and was her first album to peak at number 1 on the US Billboard 200, eventually selling more than 10 million copies worldwide.The Best Damn Thing, Lavigne's third album, was released in April 2007, becoming her third number 1 album in the UK Albums Chart and featuring her first US Billboard Hot 100 number 1 single, "Girlfriend".Reid gave A&R Joshua Sarubin the responsibility of overseeing Lavigne's development and the recording of her debut album.
That same year, she made her on-screen feature film debut in Fast Food Nation.
In December 1999, Lavigne was discovered by her first professional manager, Cliff Fabri, while singing country covers at a Chapters bookstore in Kingston, Ontario.
Ken Krongard, an A&R representative, invited Antonio "L.
Lavigne also performed at country fairs, singing songs by Garth Brooks, the Dixie Chicks, and Shania Twain. Her first song was called "Can't Stop Thinking About You", about a teenage crush, which she described as "cheesy cute".
During a performance with the Lennox Community Theatre, Lavigne was spotted by local folksinger Stephen Medd.