Ah. Lindsey Lohan syndrome.
Although to defend both, I think they can do fine in the right roles. Lohan especially was a bright prospect once upon a time.
Before she discovered drugs, Lohan was great. She was going to be huge, but ended up another washed up child actor. Fox is a good looking, but untalented actress that thinks she's better than she is. I don't know if that's a good thing in Hollywood or not. She'll get a few roles thrown her way because of the name recognition, but if those fail she'll fade away. She already has one huge failure.