One Piece manga:http://www.mangahere.com/manga/one_piece/

According to this year's 47th issue of Shueisha's Weekly Shonen Jump magazine, Canadian singer Avril Lavigne is contributing two theme songs for the upcoming One Piece Film Z film. 

The magazine also reveals that Avril Lavigne herself is a fan of One Piece, and One Piece manga creator Eiichiro Oda is similarly a fan of Lavigne's music. The two songs, "How You Remind Me" and "Bad Reputation" will be included in Film Z, which opens in Japan December 15th.