Leo or His Decoy Arrives at LAX

Leonardo DiCaprio seems like the kind of guy who would know a lot about the Orlando Bloom/Justin Bieber/Miranda Kerr/Selena Gomez feud ... so a golden opportunity presented itself at LAX Friday night when Leo showed up ... well, there's evidence it was him.

All the photogs knew he was coming and in characteristic style he was quiet and undercover. Here's the problem ... Leo probably knew the photogs knew he was coming, so it's possible the guy is a decoy.

Help us out.  Watch the video.