Deryck Whibley and Avril Lavigne. (WENN.COM)

Rocker Deryck Whibley has backed-up Avril Lavigne's claims the pair's marriage split was amicable - insisting the former lovers are "moving forward in the most positive way possible".

Lavigne confirmed rumours the couple had split on Thursday, after months of speculation surrounding the state of their union.

Writing on her MySpace.com blog, the punk pop star said, "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. Deryck and I are separating and moving forward on a positive note."

And just hours later, the Sum 41 frontman took time out to add to confirm they will always remain friends, despite breaking-up.

He explained, "The past six and a half years have been the most amazing years of my life. It's sad it has come to an end but Avril and I are still family and moving forward in the most positive way possible.

"Our decision to part ways is amicable and she holds a special place in my heart and forever will be a great and amazing friend."

The pair wed in a lavish ceremony in 2006, but reports of an impending split have been rife since the beginning of this year.