Olivia Munn side boob
By Katie Mathewson
Women have been teasing men with glimpses of their cleavage for as long as we can remember. The latest trend doesn't seem to be push-up bras or deep Vs (though those never really go out of style), but rather, side boob. We wonder how long it'll be until girls figure out a way to bare their under boob …
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Olivia Munn knew exactly which side to show photogs at the 2013 Vantitty — excuse us, Vanity — Fair Oscars Party. Her Versace Atelier couture gown showed off her entire side from the high slit to a third of each breast.
Rosie Huntington-Whiteley side boob
This is what we imagine Superman would see if he checked out Rosie Huntington-Whiteley from the side. We're guessing Rosie had goose bumps all night in that Gucci dress!
Jessica Biel side boob
From the front, Jessica Biel's Gucci gown was modest and unique, but from the side, the actress gave a sneak peek of just how sexy she is under all that fabric.
Emma Watson side boob
Emma Watson is far from a preteen, but since we know her so well as bushy-haired Hermione Granger, sometimes she needs to remind us that she's all grown up. Her garment's cutout made her stand out at the New York premiere of "The Perks of Being a Wallflower."
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Miley Cyrus side boob
Miley Cyrus got a lot of attention at the 2013 Clive Davis Pre-Grammy Gala when she wore this Emilio Pucci dress. The frock pushed the limits (of Miley's chest), but she successfully avoided a major wardrobe malfunction. Hey, she's just being Miley.
Selena Gomez side boob
Here's another Disney kid who likes to show off her post-adolescent assets. Selena Gomez, in Gucci, sticks to the theme at the Paris premiere of "Spring Breakers." We're waiting for her to scream: "Woo! Spring break!" as she flashes some side boob.
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Jennifer Lawrence side boob
We love Jennifer Lawrence because she doesn't seem to realize her sexuality; or, if she does, she teases us with it tastefully. At the 2013 Independent Spirit Awards, Jennifer's diamond-shaped Lanvin top hinted at the treasure underneath.
Taylor Swift side boob
In an ongoing effort to establish her bad girl status, Taylor Swift has been experimenting with skin. She showed off her back in this Donna Karan Atelier gown, knowing that backless dresses are best at displaying side boob. (The grandma in the background certainly seems to think so!)
Ashanti side boob
Side boob can be done discreetly, but Ashanti wasn't interested in being coy at the 2013 Clive Davis Pre-Grammy Gala. She happily flashed her curves and a flirty smile on the red carpet.
Michelle Dockery side boob
"Downtown Abbey" star Michelle Dockery hides her side boob in sheer at the 2013 Screen Actors Guild Awards, giving even more of a tease to this already-alluring dress.
Gwyneth Paltrow side boob
Usually when keeping large portions of your breasts uncovered, you go for a more modest look elsewhere, but not if you're Gwyneth Paltrow! Her Prada dress left little to the imagination on the top and the bottom.
Amanda Seyfriend side boob
You may have to look twice to see Amanda Seyfried's side boob, but she seems to know a valuable exception to this trend: Sometimes facing your back to photogs gives the best view of your front.
Eva Longoria side boob
Eva Longoria gives a modern take on the side boob trend with this geometric Cushnie et Ochs dress. The top has an acute-angle cutout that we think was much more provocative than it was "acute."
Ashley Benson side boob
The side boob trend can be so subtle that it's almost nonexistent until you notice that shadow of a curve. Ashley Benson was watchful of how much she bared at the SXSW Film Festival premiere of "Spring Breakers."
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Naomi Watts side boob
This is a classic trick of the trade — dresses with nude fabric make it look like you're showing a lot, but can keep you covered (and save yards of dress tape!). Naomi Watts' cleverly constructed Alexander McQueen gown showed just the right amount where it counts.
Amber Heard side boob
Amber Heard has definitely heard of the side boob trend, and she's not afraid to try it on the red carpet! She proudly donned this Versace couture dress at the 2013 Vanity Fair Oscar Party.
Rita Ora side boob
Inked chick Rita Ora loves to show off her tats … and her ta-tas! Well, at least part of them. Rita seduced the cameras in her Ulyana Sergeenko couture gown at the 2013 Brit Awards.
Skylar Grey side boob
Singer Skylar Grey stepped out in a Giorgio Armani piece that lacked some serious fabric on the top. Between the pasties and dress tape the dress likely required, it reminded us that the side boob trend is neither easy nor painless!
Ariel Meredith side boob
If you're a Sports Illustrated swimsuit model, you can bet you have no problem showing skin. Ariel Meredith certainly doesn't — she gave fans a sneak peek of side boob. (Ironically, they've seen her in much less.)