WendyB linked to Topaz Horizon on her blog in talking about domestic abuse. (I'm not linking, 'cause Wendy got the permission, not me - but DO check out Wendy's blog!) The blogger at Topaz Horizon discusses her own experience of being in an abusive relationship, and it is eye-opening.
I can't really comment on the lives of celebrities, (though of course I do), because by the time we read something on the internet lord knows how many ways it's been distorted. In the case of the singer currently in the news, I hope the people closest to her are watching the situation like hawks. Hawks with guns.
However, if you know a teen you might want to share these posters with her or him. They were a joint project with the Speers Society, the Toronto Police, and Kids Help Phone, and designed by students from Seneca College. I think they do a good job of addressing how abuse might present in a teen relationship, and what it does to the abused party (isolate, destroy self-esteem, etc.). I post them here without permission, but if you want to order them or find out more, there is contact info here.