Wow, those white spots would drive me nuts. Maybe the bag has sentimental meaning to her because isn't that the one Jason got her for Christmas? She probably doesn't want to replace it (even though she has the money to) because it was a gift from him.
I've seen her in pictures with other bags, but this by far seems to be the one she wears the most.
I actually admire her for her restraint on designer bags. If I had her $$$ I'd have 20 Chanel bags by now. I guess that she has to budget her money on more than just bags (clothes, shoes), because of her "fashionista" image.
I love LC!