It's official: Hollywood has declared the vagina its favorite most fashionable erogenous zone — for this year, at least. While trends undoubtedly come and go, the red carpet has recently seen a spike in styles that bare it all down below. One particular style, however, has taken Celebrityville by storm and it involves the female genitalia. You know how they say "free the nipples"? Well, free the vaginas! Here, we highlight everything you need to know about the "vagina dress," the risky new fashion trend you need to see to believe.