I usually attribute Salma Hayek's impressive rack to the fact that it's Salma Hayek, but take a look at these Hollywood street shots and see if you don't spy another explanation. Is Salma pregnant? Her boobs look big, but, uh, well, so does everything else.

Update: It has been confirmed that Salma Hayek is pregnant. She is also engaged to Francois-Henri Pinault, who is (obviously) the father.