Good points in this Chron article citing the creep-factor of counting down to girl-celebrities' coming of age:
The coming of age of a female celebrity has always been a strange loophole in society's sexual mores. We live in a nation where schools send girls home for showing too much skin and a 38-year-old singer's jack-in-the- box boob becomes a federal case. But adult males get a flier to revel in the prospect of deflowering a Kournikova, Olsen or actress Lindsay Lohan (she's 18 in eight days!) - knowing it would have resulted in a statutory rape charge just a few hours earlier.