The singer announced her engagement to the Nickelback frontman last August (12) and they have been busy planning their upcoming wedding.
Lavigne has now revealed they sealed their love by having matching body art inked during a romantic trip to Paris, France.
She tells Etcanada.com, "I got 'Live in the Moment' in French: 'Vivre le moment present.' I said, 'I got a surprise for you, took him to get tattooed.' He probably was thinking I was going to take him to the Eiffel Tower or something."
Lavigne also reveals the couple's wedding has been booked and she has taken care of most of the details: "I want to go all out with this wedding. What's most important is getting the dress, getting the wardrobe, the rings, location booked. All that's taken care of."
However, Lavigne hasn't been able to decide which song to play for their first dance as husband and wife, so she is considering using a track the couple wrote together.
She adds, "I think we'll just play a song maybe that we wrote together. But I haven't thought that much about it yet."