Avril Lavigne is the singer and songwriter of My Happy Ending.
Avril Lavigne . Lavigne has scored six number-one singles worldwide , including `` Complicated '' , `` Sk8er Boi '' , `` I 'm with You '' , `` My Happy Ending '' , `` Nobody 's Home '' , and `` Girlfriend '' . `` My Happy Ending '' is a song by Canadian singer-songwriter Avril Lavigne , written by herself and Butch Walker for her second studio album , Under My Skin ( 2004 ) .