Heidi's face looks a lot different today (and I'm not just talking about age). Has she undergone surgery? I thought I once read somewhere that she was adamantly against plastic surgery, botox etc.
Here's an old youtube clip of Heidi and Amber Noelle. It's funny how the guy pretty much says that Heidi is the much more beautiful one of the two models.
Also cool how Heidi cleans the camera in the middle of a hurricane!