I guess because she is so successful and is not a classic beauty. She was married to one of Hollyweird’s hottest hunks, Brad Pitt. She became even more popular when he took up with Angelina Jolie, and people sympathized/felt sorry for her. And, people just really seem to like her. With the kind of movies she makes, though, I personally have no respect for her.
I find her attractive, too. And for 43, she looks fine to me! I think she’d do better trying to find interesting roles as a supporting character in independent films.