It just wouldn’t be Halloween without the sexy costumes, but these celebrities take it to a whole other level — with some even bypassing clothes completely! Both Miley Cyrus and Blac Chyna have proved that less definitely is more — but are they taking it too far? Many people like to joke that racy costumes are just an excuse for people to party in their underwear and not feel guilty about it. As Mean Girls famously quoted, “In Girl World, Halloween is the one night a year when a girl can dress like a total slut, and no other girls can say anything about it.”

But is there a deeper meaning to why so many celebs show up to Halloween parties and events without any clothes anymore? According to a Mic interview with Amanda Hallay, a professor teaching fashion history at LIM College in New York, the “sexy costume” revolution started only a few years ago, mostly thanks to pop culture icons like Britney Spears. In the late 90s, low-cut jeans, midriffs, and bandage dresses suddenly became all the rage, and that trend bled into the Halloween costume world.

But these days, revealing costumes have gone to an ironic extreme, with costume companies selling ridiculous outfits like “sexy Lobster” and “sexy Hamburger.” It’s almost as if buyers are trying to have their cake and eat it, too. But when it comes to celebrities, because they have more access to acquire awesome ensembles to blow everyone away, they’re more likely to dress provocatively because it’ll get them more attention. And also, at the end of the day, if you look and have a body like Alessandra Ambrosio, why wouldn’t you show it all off for the world to see?

Check out the gallery below to see stars’ most revealing Halloween costumes — ever.