The singer recently got engaged to Nickelback singer Chad Kroeger, and has already made plans for the outfit she will wear on her big day.
Lavigne explained that she may rip up a number of pieces and put them all back together to create the final piece. Alternatively, the Abbey Dawn designer may team up with another clothing brand to think up her dream gown.
She told People: "I have an idea of what I want. It might be something that I buy a few different dresses and rip them up and put them all together and dye them, or maybe I'll kind of do a collaboration with another designer."
She added that she is obsessed with her pear-shaped diamond engagement ring, and encouraged every girl to get a ring from their guy.
She continued: "I can't take it off. I sleep with it on. It goes with every outfit. Get engaged, it's the perfect accessory for every outfit. I did it. You should too."