Teigen has been known to stand up for stretch marks, so by no means is she immune to those little beauty "imperfections" we all experience at some point. It's refreshing to see someone in the spotlight own those imperfections, but it's equally awesome that she doesn't fear a fitted dress when her body is changing drastically.
There was a time (before Demi Moore paved a new way by posing naked for Vanity Fair while she was nine months pregnant) that people would shun pregnant women for showing off their bodies like this. We should all be thankful we live in time and a country that appreciates this as sexy (or at least more than we used to).
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I am not a mom yet but when that day comes, I'll be grateful for a society that is more accepting of women's bodies no matter what stage or shape they are in. And for those people who don't, I'll be dammed if I let them stop me from wearing something they think I shouldn't (after all, it may be the only time in my life I have any kind of cleavage).
For too long, moms have been stereotyped as bland, the opposite of sexy or stylish, and you don't have to be a celebrity to prove that wrong. If you want to wear a fitted dress, do it. It you want to wear a mu mu, that's OK, too. Just make sure you're doing it for you, and not not doing because of someone else.