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It's Miley and Mary Jane!

Over the weekend Miley Cyrus took her boxer mix for a walk in the neighborhood, and though she looked great in a pair of leggings and sneakers, she seemed a little bummed! Not nearly as sad as she looked in her Marc Jacobs ad, but we wish she had cracked a smile ... or at least stuck out her tongue!

Despite her somber appearance, the 21-year-old starlet tweeted, "I love being alone on sundays," but on Saturday she wrote, "I get called an ugly lesbian a lot more than one would think. Or maybe not. Can u atleast call me an interesting lesbian. I hate the U word."

Aww, Miles! Cheer up buttercup!