Why do ppl/the media in the US call Jennifer Aniston "America's Sweetheart",& not someone like Kristen Stewart?

becoz they admire those kind of fake personality.... n i'm with you....i love kristen not becoz she smokes,but becoz she is very down to earth n she has that kind of a bad girl look that doesn't seem to care about what people think about her....this makes her real.... i think kstew is the best version of bella just like rpattz is the best version of edward.....