Steve-O is back in action – sans “Jackass” crew. For his latest stun, the star taped himself to a Hollywood billboard to promote his new comedy special “Gnarly,” which is now available on his website.

The whole thing went down yesterday morning – and it caused more of a scene than Steve-O intended. While he’s not sure the stunt was “legal,” Steve-O did rent the billboard promoting his new special… which he was then strapped to with a bunch of black tape. Speaking to “TMZ’s” cameras, Steve-O also revealed he was wearing a diaper! You know, just in case.

Steve-O had the whole stunt planned out, complete with a crew on stand-by to help him get down safely. But the fire department ended up zipping to his rescue anyway… and blocking traffic in the process. Since the prankster paid for the billboard, law enforcement tells “TMZ” that Steve-O isn’t facing arrest or any criminal charges.