Jessica Simpson's mother lashes out at her?

Jessica Simpson's mother reportedly lashed out at her daughter in front of Dolly Parton after she forgot the words to the country star's 9 to 5.

According to website TMZ.com, Tina Simpson was furious with Jessica Simpson after she flubbed lyrics, stood statue-still on stage while trying to hold her dress up, and then awkwardly hurried off with a few mumbled words to Parton.

"Dolly you make me so nervous. I can't even sing the words right," Simpson said at the time.

Tina told her daughter that the performance was "embarrassing" and "unprofessional," and mom was further incensed because Jessica had missed a dress rehearsal and hadn't adequately learned lyrics to the song -- which necessitated cue cards at the front of the stage. Jessica can be clearly seen reading from the cards during her performance.
The show's producers insisted that she re-tape the performance without anyone in the audience if she wanted to be included in the show's broadcast.

A source at the US network CBS said, "We almost cut her out of the show."

Later, Simpson's rep, Cindi Berger, said the singer was "overcome with emotion" during her performance. "She wanted the song to be perfect and she was upset with herself when it wasn't," Berger told USA Today.

Meanwhile, People reports, Dolly Parton has no hard feelings toward Jessica Simpson, who flubbed the lines to the country singer's song "9 to 5" during the Kennedy Center Honors on Sunday.

"Jessica is so talented that I'm sure that someday they will be paying tribute to her and I would be honored to perform for her," Parton said in a statement to Inside Edition on Thursday. "But I'll probably be so nervous that I'll forget my wig!"