Michael Buble had some fun with the audience at his iHeartRadio Live concert in Tribeca ... at Kim Kardashian's expense.

While performing at the P.C. Richard & Son Theater, Buble told the crowd:

    Ladies and gentleman, I have a very special guest. Please welcome Kim Kardashian [to the stage]. Nah, just [bleeping] with you! That b**ch isnt coming on my stage.

Ouch! And Buble didn't stop there. The crooner then dedicated his song Feeling Good to Kim's estranged hubby Kris Humphries.

Gotta love Buble's sense of humor!