Jay-Z once said, "when a good girl goes bad, she's gone forever," and how true it is. K-pop's made up of two kinds of girls: innocent and sweet vs. sexy and fearless. We're used to the ladies who are always half-naked, prancing around in booty shorts but it's the ones that we don't expect to be all kinds of sexually daring that catch us off guard. We're just not used to the girl-next-door ones getting all dolled up in magazine spreads that would make any grown human being blush. Let's take a look at some good girls gone bad!

Good girl actress Shin Se Kyung didn't play it safe when she posed as the exclusive model for lingerie brand "Vivien" showing her goods in a revealing laced up tank-top with a pink bra and all.

Talk about cleavage! We've seen Girls Day covered and semi-covered but we've never seen the 4-member group like this before. Low tank tops, suggestive hand moves on thighs, booty short shorts? Tony Ahn must be loving Hyeri's looks! I prefer these girls covered up and innocent.

SNSD's Jessica took the leap into the world of sexual appeal when she posed as a model for "Ceci Magazine" looking quite tempting. The singer wore a pleather zip-down top which she can be seen pulling open. I prefer innocent and covered up Jessica so much more!

The Wonder Girls are always suited up and always looking classy. But on their last album, JYPE sexed them up, not in their attire but in their suggestive poses. The group's resident cutie pie Sohee had the sexiest photo of all, with the the gun trigger near her lip.

K-pop's most notorious good girl gone recent bad girl, i.e. Eunhyuk photo scandal, will always have that sweet, innocent look to her that's both inane and conjured up by her agency. But IU was anything but good when she posed for "Vogue Girl" in a corset over a tee about to bite into an apple, also known as the forbidden fruit.