If you’ve seen the previews for “Zoolander 2” then you know that JUSTIN BIEBER makes a cameo as himself . . . being MURDERED. Well, people at preview screenings have been CHEERING when it happens.

And BEN STILLER has a message for them. Quote, “I think they all want to be him . . . They all want Justin Bieber’s life, let’s face it. I think he has a sense of humor about all of it, and I also think he has the last laugh, too.”

He adds, quote, “He’s an incredibly talented guy who, for whatever reason, affects people this way. But he’s a great kid, and I was very fortunate to have him in the movie.”