In 2008, Lavigne introduced her clothing line, Abbey Dawn, and in 2009 she released her first perfume, Black Star, which was followed by her second perfume, Forbidden Rose, in 2010 and her third perfume, Wild Rose, in 2011. Whibley and Lavigne continued to work together, with Whibley producing her fourth album, as well as Lavigne's single "Alice", written for Tim Burton's film Alice in Wonderland.
In July 2006, Lavigne married her boyfriend of two years, Deryck Whibley, lead singer and guitarist for Sum 41. In school, she was sometimes kicked out of class for misbehaving, her parents supported her singing.
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 12 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".
She voiced Heather, a Virginia opossum, in the animated film Over the Hedge in 2006.