The pair exchanged vows at Chateau La Napoule, a restored castle, in Mandelieu, France on 1 July (13) - the first anniversary of the start of their relationship, as well as the national day of their native Canada.
The Nickelback star has now opened up about the big day, admitting he was overcome with emotion as his partner walked down the aisle.
He tells Britain's Hello! magazine, "I had goosebumps from head to toe and my eyes filled with tears. It's a moment I will never forget as long as I live."
Lavigne adds, "Before I walked down the aisle, I had to take a few breaths because my heart was pounding. It was so intense.
"My body was overtaken by emotion. I saw him and he was so calm and happy. He had a tear coming down and he wiped it away. I felt so good walking to him. It made me feel like a complete woman."
The couple is now enjoying a honeymoon in Portofino, Italy - they were spotted onboard a yacht on Monday (08Jul13).