Do you agree with this weight rule?

[M]

Health and fitness are about more than numbers on the scale. Any method -Hamwi, BMI, etc. -that only looks at height & weight is missing a big part of the picture. For one thing, muscle weighs more than fat, so two people of the same sex, height, and weight can be at very different fitness levels; BMI often tells very muscular athletes that they are obese. (Another problem with BMI is that it doesn't account for sex, and females are *supposed* to have a higher body fat percentage than males.)
Also, celeb culture and media obsession with thinness do not necessarily correlate to 'what men want'; while it is based in large part on 'the male gaze', that is more of a perceived social force than any real person or group of people.

But yes -it is quite common for celebs to be underweight, and to be pushed to make themselves underweight. Like -when Kim Kardashian was pregnant, she was being criticized a lot for weight gain, being called a whale, etc., even though she was freaking pregnant; the horrible reactions to pretty much any woman celeb when she gains weight, like Britney Spears and Jessica Simpson post-baby; the sheer number of celebrities who end up painfully thin and spark rumours of anorexia; etc., etc.