Porn Star Jesse Jane -- Passed OUT COLD On the Vegas Strip! (VIDEO)

This is not the way you typically see porn legend Jesse Jane on her back -- she got so blasted in Las Vegas, she fell unconscious on a sidewalk in the middle of the day.

According to witnesses, 35-year-old Jesse was with a small group of friends on Tuesday when she went down across the street from Planet Hollywood Resort and Casino ... shortly after 1 PM.

You can tell from the video, Jesse is completely unresponsive. In other words ... her fun day in Vegas just took a turn for the worse. MUCH worse. We're told her friends eventually stopped trying to wake her up, and just carried her away.