Claim: Avril Lavigne is the singer and songwriter of My Happy Ending.
Evidence: 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 -LRB- 2004 -RRB-.