Karl Malone is a big fan of Post Malone -- and the feeling's apparently mutual, 'cause the rap star rocked the Hall of Famers Jazz jersey during a recent concert in Utah ... and the Mailman, who happened to be at the show, absolutely loved it!
The Jazz posted video of Karl, 59, at Post's concert at Vivint Arena in Utah ... showing the "Congratulations" rapper getting showered with cheers from the raucous audience. The camera then pans to KM ... who has clearly jazzed the rapper rocked his jersey.
Of course, Karl rocked the iconic #32 jersey throughout his legendary NBA career.