Avril Lavigne is a musician.
Avril Lavigne . Her breakthrough single , `` Complicated '' , peaked at number 1 in many countries around the world , as did the album Let Go . `` Complicated '' is the debut single by Canadian singer-songwriter Avril Lavigne , released in 2002 from her debut album , Let Go . Let Go is the debut studio album by Canadian singer-songwriter Avril Lavigne , released on 4 June 2002 .