The 26-year-old singer, who was married to the Sum 41 musician for four years until they split in 2010, insists the pair are still very close and "respect" one another.
She explained: "We're very good friends. He's family to me. We both respect and care for each other very much. We're in a great place."
As well as maintaining a personal Friendship, the 'What the Hell' star has continued to work musically with Deryck, who helped her write her new album 'Goodbye Lullaby'.
She told The Sunday Times Magazine: "I have a lot of respect for him as an artist. He's one of the most talented people I know. He did an awesome job on my album."
Avril is now dating former 'The Hills' star Brody Jenner, with the pair proving their devotion to one another by getting matching lightning bolt tattoos.
The Canadian singer also recently made headlines by showing fans the latest addition to her body art collection - the word 'f**k' inked onto her ribs.