Kanye West got mad ... real mad (Joe Jackson) ... at a paparazzi in Miami last night ... after the snapper fired off some questions about Kim's ex-BF Reggie Bush.
Kanye and Kim Kardashian were leaving a dinner date in Miami Beach, when the photog -- NOT OURS -- shouted, "Kim did you know Reggie is here [in Miami] having dinner?"
The pap continued, "Did you wanna go congratulate him on his pregnancy?"
That's when Kanye snapped -- angrily rushing after the female pap after grasping for her camera -- but never actually striking the woman. Kim was smiling during the entire confrontation.
K&K then got into a waiting Rolls Royce Phantom and left the scene.