Lil Nas X 's nearly naked adventure was brewing almost 15 hours before his early morning arrest ... based on a new strange video of him wandering aimlessly around Hollywood!

TMZ Hip Hop obtained this surveillance footage recorded outside the Short Stories Hotel around 1:30 PM Wednesday. Sources at the hotel confirm he was there, although he was not a registered guest. Play video content

Still, the video makes it seem like he was going through something -- you see Montero all by himself strolling off the street, and into the hotel's courtyard area. TMZ.com

Unlike his shocking encounter with a bystander early Thursday morning, Lil Nas X was fully dressed at the Hollywood hotel -- cowboy hat and boots, jeans and a short-sleeved shirt -- as he fanned himself. Play video content

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