We guess "underboob" is a thing now.

When she's not acquiring 90 million puppies, doing the annoyingly perfect quintessential "we're so in love on the beach" pose with her sexy fiancé, or snapping expert dressing room selfies, Miley Cyrus is clearly vying for the "Best Side Boob/Underboob Of 2013" title. As it would appear, both kinds of cleavage are making a giant comeback this year (remember Beyoncé's inimitable underboob action? Or how about Taylor Swift's daring ensemble? Or Leah LaBelle's?), and Miley's white-hot, short-haired, side boob-centric March 2013 Cosmopolitan cover mayyyy have just placed her in the lead. (But the jury is still out, because Beyoncé is Beyoncé.)

Check out more photos of Miley Cyrus in Cosmopolitan after the jump.

Inside Cosmo's March issue, Miley opens up about her forthcoming record (you know, the one she's working on with Pharrell) and her relationship with other celebs (you know, like Katy Perry): "Katy Perry's been my friend for f***ing five years, and I'm not ever gonna let our work get between that relationship. If Katy sticks with being Katy, and Ke$ha is Ke$ha, and Rihanna is Rihanna, and I'm me, there's room for everybody." We agree -- there's room for all y'all gals! Each and every one of you brings your own special brand of cleavage to the table (some more than others). And we think things will go smoothly, just as long as the whole crew is OK with Miley's reigning side boob.

Photo credit: Cosmopolitan