The Jenner split has become a tragicomedy ... Bruce can't seem to muster a happy face, and Kris can't help but smile.
The separated duo both showed up to a production office in L.A. today, wearing drastically different expressions -- just one day after announcing they were living apart.
Both have said they're happy with the current arrangement, but Bruce was cursing like a sailor yesterday about it ... and appears to be clinging to his wedding ring. Unlike Kris.
Still, gotta respect their work ethic.