A patient arrived for his psychotherapy session at a ’s clinic in Brooklyn — and shot a receptionist in the face, cops told The Post.

Leonard Booker, 35, walked into the New York Psychotherapy and Counseling Center in East New York at 3:05 p.m. Saturday and allegedly shot Julien Rivera, 30, before fleeing.

He was nabbed nearby.

Rivera will be OK, but still has a bullet lodged in his jaw.