You might not realize it at first, but there are a handful of styles that fall under the term "crop top." You've got your classic t-shirt variety, which pairs well with pretty much everything; crisscross and cutout options, both of which add some flair; and now, there's the underboob crop top, aka a sexy, revealing trend celebrities couldn't get enough of this past year.

Hitting riiiiight below the nipple and letting, well, some underboob pop out, it's one of the more revealing shirts we've seen — if you even want to call it a shirt. Scroll through for few we've spotted on the Spring '17 runways, then check out how celebrities have been styling them as of late.

Kanye's Latest Yeezy Collection Included the Underboob Crop Top

Kylie Jenner Even Wore 1 to the Show!

Don't Want This Alexander Wang Shirt to Reveal All? You'll Likely Have to Layer It

Some Stars Would Likely Position This Adam Selman Piece an Inch Higher

Gigi Hadid Rocked a Lacy Layer Under Her Black Underboob Top

But Lady Gaga? She Went Bare

She's Obviously Loving This Trend

As Is Teyana Taylor, Who Embraced the Trend Both on and Off the Runway