Jessica Simpson's 'Off' Performance

Jessica Simpson reportedly forgot some of her lyrics while performing in Grand Rapids, Michigan on Thursday -- and the video has leaked onto the Internet!

Simpson looked sexy as she graced the stage in cutoff jean shorts and a tight top, but she mumbled stanzas during her performance.

The 28-year-old has been battling a media bubble over her weight while on tour as the opening act for Rascal Flatts. Reports say the blonde songstress held back tears during her 35-minute set and suffered a "meltdown."

The singer's rep released a statement saying, "Jessica had an off night. She's a perfectionist and wanted to start some songs over. She always wants to give the best performance for her fans."