Sarah Harding has hit back at claims that she is underweight, insisting her skinny frame is down to eight hour dance sessions.

The Girls Aloud star – whose single The Promise reached number one this Sunday – told a UK publication that she scoffs herself silly when she's on tour with the girls.

Sarah told The Sun, “I’ve just had two McDonald’s breakfasts! I’m not ill at all.

“It’s not like I don’t eat anything, I eat like a horse. I just burn it off.”

Bandmate Cheryl Cole also had fans worried after she shrunk down to a size zero following her husband Ashley Cole's infidelity.

See Sarah's frail frame below