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Miley Cyrus, Stephen Baldwin, Justin Gaston

Anthony, PacificCoastNews.com

Talk about random...Miley Cyrus, along with Justin Gaston and her mom, hit a Christian bookstore last night in Tennessee for Stephen Baldwin's book signing. One word: why?

"I'm not exactly sure," her rep said, who's apparently as mystified as we are by this surprise showing. "I know they're friends of the Baldwins."

And it gets even weirder...

Stephen showed off an "HM" tattoo on his upper bicep that reportedly stands for Hannah Montana, Miley's hit Disney show. The story is that Miley dared him to get the tat, in exchange for a cameo on her show.

While Stephen's manager wouldn't confirm if that's what the tat means, he did "there's a possibility" he'll be appearing on an upcoming episode.

As for how the odd couple first met? "Miley is friend's with Stephen's daughter," according to his manager.

The Disney teen is in town for the CMAs tomorrow night, where she'll be a presenter. Wonder if Justin will walk her down the red carpet for the first time?