Avril Lavigne has filed for divorce from rocker Deryck Whibley.

Avril announced her separation – but not a divorce – from the rocker on her website last month.

“Deryck and I have been together for 6 and a half years. We have been friends since I was 17, started dating when I was 19, and married when I was 21. I am grateful for our time together, and I am grateful and blessed for our remaining friendship. I admire Deryck and have a great amount of respect for him. He is the most amazing person I know and I love him with all my heart,” she wrote at the time.

“Deryck and I are separating and moving forward on a positive note…”

The “Girlfriend” hitmaker has moved to officially end her marriage to Sum 41 singer over “irreconcilable differences,” according to papers filed in Los Angeles Superior Court on Friday. Avril lists their date of separation as September 4, 2009, three years and one month after their July 15, 2006 wedding.

The estranged couple has no children and Avril has asked that Deryck not receive spousal support.