(Cover) - EN Star Style - LeAnn Rimes has hit out at claims she has been working out too much.

The 28-year-old singer appeared at the NCAA basketball championship game in Houston, Texas, on Monday to perform the US National Anthem and her slimline look shocked some attendees.

LeAnn wore a skimpy white Dolce and Gabbana minidress and her figure was extremely slender, causing speculation she has been taking her fitness regime too seriously.

The star has hit out at the rumours, saying she gets angry when people make assumptions without knowing any facts.

"To those who have to turn to other's lives and judge with no real knowledge of how anyone lives, you can you know what (sic)! wrote LeAnn on her Twitter page.

The songstress and her fianc Eddie Cibrian are currently preparing for their upcoming wedding, which is set to take place in the summer. It has been claimed that the star has been taking her pre-marriage health regime too far, but LeAnn says she is completely healthy.

"@legg864 dear lord! I do not work out too much nor do I starve myself. I'm so over this and moving on (sic), LeAnn wrote to one Twitter user. (C) Cover Media