Idk man...that's one picture that doesn't even look like it's her. I've seen some huge fake ones that look absolutely nothing like hers. I feel like it would be extremely difficult to get big ones not to look obviously fake, which hers don't.
Yeah, and she is generally much more full-figured now, and some women's breasts really grow or shrink as they gain or lose weight, like, out of proportion to the rest of their bodies.
I have a college buddy who had a girlfriend like that. When we met her during college, she was not fat but, umm, provocatively full-figured, let's say. Kind of like Christina Hendricks now, but not quite THAT full-figured. What we didn't know at that time is that, even though my buddy thought she looked great, she was puffed up with college beer-and-late-night-pizza weight. After she graduated, she lost a ton of weight and I swear 90% of it was in her chest. It was really weird because she looked almost the same, but with way smaller boobs.
So I could buy that Christina's are natural, but no question the stark contrast between 1999 Christina and 2009 Christina raises some doubt.