Avril Lavigne is single again. The Napanee singer-songwriter says she’s split from husband Deryck Whibley after three years of marriage. The 24-year old pop star says she and Deryck are separating and moving forward on a positive note, and she thanks her family, friends and fans for all their support. Lavigne and Whibley, the frontman for Canadian pop-punk group Sum 41, began dating in 2004.