One of the first things to go in pregnancy is a mama-to-be's waist. As the belly grows (and moves up), the definition between the bustline and the stomach becomes increasingly difficult to find. For years, form-fitting maternity clothes were the expectant woman's friend for showing off her figure, but with looser styles making a comeback, it's becoming harder for fashionable pregnant women to show off their beautiful figures. Last week Tori Spelling explained her waist-defining maternity trick — wearing a belt between her bust and her belly — and now it looks as if she's not the only one subscribing to the style. Take a look at how some of our favorite pregnant celebs make this style their own!