Washington, Feb 7 : Singer Jessica Simpson has apologised to fans for her recent goof up after she forgot the lyrics during a show in Michigan on February 5.

The star's fans were stunned when they saw her stumbling through her performance at the Van Andel Arena in Great Rapids.

The singer was mumbling her lyrics, forgetting words and fighting back tears during a 38-minute set, supporting country trio Rascal Flatts.

A local concert reviewer said that at one point, Simpson stopped the show and asked her band to start a song again.

Although, she did say "sorry" to fans right then, but on Feb 6 her publicist blamed it all on "an off night".

"She''s a perfectionist and wanted to start some songs over," Contactmusic quoted her rep as saying.

The concert comes as Simpson''s apparent weight gain makes headlines in the U. S. tabloids, after the singer was photographed looking rather `curvy' at a recent show. (ANI)