I don't think she is too skinny. I think she looks great with her young hubby. Demi is a perfectionist and a trend setter and just wants to look her best at an event. She had gained a lot of weight at one time with many unflattering pics criticizing how soccer mom average he looked. Now she's too skinny and they wonder why Demi doesn't respect the press.
Celebs are under a lot of pressure to look their best at all times, despite age, despite kids, despite sun damage, despite insomnia, despite stress, despite drugs, despite life, despite jail, despite the weather and despite physical pain. Celebs must look good despite it all and what they do to maintain physical perfection is no superficial accomplishment.
Demi has more money and time on her hands then most but people like her gave lots of women hope they can still look good despite life thus motivating women to find clever ways to make time to eat better and exercise. Hope, envy, jealousy, insecurity and competition are all powerful motivators that should never be underestimated.
Times have changed thanks to generation bb or the baby boomers whom told the world that age 40 is the new 20. They just wouldn't except the 40 plus women can't be as sexy as she was in her youth. Generation challenged societal preconceptions and found no reason why the average women can't be a yummy mommy just like Demi. Then they took it even further when they declared why must i be sexy for my age? Why cant I just be sexy? And they are sexy and soon the world will catch up and discover the bb's are right.