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    Selena Gomez Previews Sexy "Secret Project" as Justin Bieber Models Calvin Klein Underwear—See the Pics!

    Selena Gomez Instagram Instagram

    It's hard to keep up with Selena Gomez and Justin Bieber!

    On Tuesday, the "Come & Get It" singer Instagrammed a sneak peek of her "secret project" as her former flame modeled some Calvin Klein underwear. Both Selena, 21, and the Biebs, 20, showed some skin in their coy, trying-to-keep-us-guessing pics.

    Let's assess! As you can see, Selena's behind-the-scenes Instagram snap shows the singer wearing a short, sexy black ensemble that reveals her back, lots of a leg and even a hint of underbutt. The brunette beauty can't help but checking out her own reflection in the old-school light-up mirror!

    PHOTOS: Justin Bieber's best shirtless shots

    Justin Bieber, Instagram Instagram

    The Biebs heated up Instagram right around the same time as Selena, only he was looking for some reaffirmation from his Beliebers, it seems! Wearing an unbuttoned shirt (which is close enough to shirtless, given how much of his bare chest is clearly visible), Justin appears to gaze wistfully down at the black Calvin Klein underwear peeking out from his pants.

    "What if I do a Calvin Klein campaign?" he asks, adding, "Comment below yes or no." (As you can imagine, the Beliebers have lit up the comments' section there with some very eager NSFW responses.)

    Could Jelena's vague social media posts have anything to do with each other? Let's not get our hopes up just yet. For now, let's just soak in Justin and Selena and their provocative ways!

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