Justin Bieber is in a race to the bottom ... but at least now he's got some attractive company.
Bieber took a 1-on-1 hike with his model friend, Ashley Moore, who seemed down to get physical with him in a friendly competition running on a canyon trail.
If there's one thing we know about Bieber ... he tends to open up in the wilderness. Bodes well for Ashley. Plus they've hung out before --
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