Allegations of Plagiarism

On May 25, 2007, Lavigne, her co-songwriter Lukasz Gottwald, and her record label were sued by songwriters James Gangwer and Tommy Dunbar over claims that her song "Girlfriend" infringes on their 1979 song "I Wanna Be Your Boyfriend", originally performed by The Rubinoos.

In June 2007, Canadian singer-songwriter Chantal Kreviazuk, with whom Lavigne wrote the majority of her second album, Under My Skin, spoke to Performing Songwriter magazine about Lavigne's songwriting, saying, "I mean, Avril, songwriter? Avril doesn't really sit and write songs by herself or anything. Avril will also cross the ethical line and no one says anything. That's why I'll never work with her again. I sent her a song two years ago called 'Contagious', and I just saw the tracklisting to this album and there's a song called 'Contagious' on it – and my name's not on it. What do you do with that? See, I won't [call the lawyers], I'll just tell you. Art should not be subject to that kind of controversy."

On July 6, Lavigne denied both accusations in an open letter on her website, claiming that she had "never heard the [Rubinoos] song in [her] life" and also that she is considering taking legal action against Kreviazuk with regards to her allegations, which she considers "damaging to my reputation and a clear defamation of my character".

On July 10, Kreviazuk made a full public apology and retracted the statements made in the aforementioned interview, saying "I would like to apologize for any misconceptions concerning Avril Lavigne, which may have resulted from statements I made in my interview with Performing Songwriter Magazine. It was not my intention to call Avril's songwriting ability or ethics into question. My statements and any inference from my statements, which call into question Avril's ethics or ability as a respected and acclaimed songwriter, should be disregarded and are retracted. Avril is an accomplished songwriter and it has been my privilege to work with her."

In January 2008 Dubar and Gangwer dropped their lawsuit and retracted their allegations of plagiarismThe song "I Don't Have to Try," also stirred up controversy. Similarities between this song and Peaches' 2003 song, "I'm the Kinda" has sparked further plagiarism speculations.However, Avril has cited Peaches as one of her favourite artists, and Peaches had nothing but nice to say about Lavigne: "She is a huge superstar and she is a young girl, but she’s also a hard worker. Avril has to be. Musicians aren’t living the life. She has to be present and on at all times. I’m glad she was influenced by me; it brought more attention to my song. All of a sudden, half a million people are listening to my music because of her.