I remember when my daughter was a tween her bedroom was covered with posters of Marie Osmond and once in a while brother, Donny. What a clean and wholesome image they protrayed to tweens. With their own television show, the siblings even fussed at each other showing that was normal.
Sarah, one of our fans at The Kids Speak Out, left a comment that I completely agree with. She stated that Hilary Duff, an idol to Tweens, have kept herself clean, wholesome and protraying an image to young people saying "it's OK to be good". However, as Sarah pointed out, Hilary is not as marketable as some of the other idols who get into trouble and slowing destroying their lives right in front of our Tweens.
As parents there is a strong need for you to watch the Tween Idols to make sure your Tween is being exposed to the type of idols that will ensure that "it's OK to be good".