And btw, the comment cannot be interpreted as cruel. At the absolute MOST it's a tad bit irresponsible but even that is reading too much into it. She didn't say "all pretty people don't eat" she said "popstars."
Eating disorders have the highest mortality rate of any mental illness and the mortality rate associated with anorexia nervosa is 12 times higher than the death rate of ALL causes of death for females 15 – 24 years old. So I think it was insensitive but overall irresponsible to convey that message to her impressionable young following.