http://www.toofab.com/2014/10/28/renee-zellweger-no-makeup-photos
So she looks the same as she did before w/o make up on, just older. When she was younger, her face was rounder and I bet she had fillers done here and there (plus she famously gained and lost weight for roles, which can affect such thngs) So last week was just a crazy make-up job? I don't think she looked bad last week, just different than people were used to seeing her.
I think the attention paid overall was ridic, but in seeing this picture, it doesn't seem that she's changed as drastically as people think she has.