Irreplaceable is a song written by American singer-songwriters Beyonce Knowles and Ne-Yo , and Norwegian songwriters Mikkel S. Eriksen , Tor Erik Hermansen , Espen Lind , and Amund BjÃ rklund for Knowles ' second studio album , B ` Day ( 2006 ) . `` Irreplaceable '' is a song recorded by American R&B singer BeyoncÃ Knowles for her second studio album , B ` Day ( 2006 ) . The song was written by Knowles , Shaffer `` Ne-Yo '' Smith , Tor Erik Hermansen , Mikkel S. Eriksen , Espen Lind , Amund BjÃ rklund , and produced by Stargate and Knowles herself .