The fans of popstar-turned-country singer Jessica Simpson were left stunned when she failed to recall the lyrics during a show in Michigan.
The star has apologised to her fans for the embarrassing incident.
Simpson left fans stunned when she stumbled through her performance at the Van Andel Arena in Great Rapids, mumbling her lyrics, forgetting words and fighting back tears during a 38-minute set, supporting country trio Rascal Flatts, 'E!Online' reported.
According to one local concert reviewer, Simpson stopped the show at one point and asked her band to start a song again.
She apologised onstage by saying "sorry" to fans. Her publicist yesterday declared that she just had "an off night".
"She's a perfectionist and wanted to start some songs over," Simpson's representatives said.
The misadventure occurred at a time as Simpson's weight gain has made headlines in the US tabloids.
It's not the first time critics have targeted Simpson for her forgetful nature onstage, she was ridiculed after singing a very poor version of Dolly Parton's '9 To 5' hit during a tribute to the country legend at the Kennedy Center in Washington DC in December, 2006.