The Rock and his new 'Jumanji' costar, Danny DeVito, did their best Vince Vaughn and Owen Wilson south of the border -- but, truthfully, it's hard to say if it's an ad or for real.
Case in point ... Dwayne Johnson's video from Sunday -- he and Danny elaborately ducked in on someone's wedding down in Cabo San Lucas and crooned to the crowd. It's sooo well-produced ... like a short film or something ... it feels like it was staged.
However, the pics of their wedding crashing cameo seem pretty candid .