I think most models/actresses are more likely to have boys (mentioned somewhere here on this site) Maybe it's because of the maternal dominance theory, maybe it's because they've had eating disorders and improved their condition To TTC, or perhaps they stay slim by doing an Atkins/paleo type diet as well as adopting the 6 small meal a day thing. Models are also quite tall and somewhere I read that tall women are more likely to have sons.....maybe because of potential higher growth hormone levels? If less sleep sways girl, and sleep produces growth hormone, then perhaps the mere presence of elevated growth hormone sways blue (I'm purely speculating).After reading of their predisposition to have boys, I thought I'd hunt out the girl mom celebrities and see what they were up to as they are part of a minority.
Oh and I'd add to the list:
Blake Lively had a girl. She seems to stay up baking until odd hours of the morning (no sleep), likes to live actively with hiking and other cardio activities (hates the gym) and likes to balance her indulgence of sweets out with extra healthy habits like vege juice meals (no protein or fat) "moderation/portion control = calorie restriction)