Red Star chalked up their third successive win under new coach Robert Prosinecki, who played in their European Cup winning team in 1991, as they strolled to a 2-0 success at Jagodina.
Ghana striker Prince Tagoe, who joined Partizan in January during the three-month long winter break in Serbia, scored his fourth goal in three games for the champions who are aiming for a fourth successive league title.
Montenegrin defender Ivan Kecojevic equalised against the run of play in the 86th minute with a superb header before Smiljanic drilled a low shot into the far corner through a forest of legs.
Prosinecki, who became the first Croat to coach a Serbian club when he took over at Red Star in January, saw his team effectively wrap up their match by half-time.
Aleksandar Jevtic put Red Star ahead with a delicate chip in the 13th minute and they missed a hatful of good chances before Brazilian Evandro scored with an unstoppable shot on the stroke of half-time.
Get the best features, fun and footballing frolics straight to your inbox every week.
Thank you for signing up to Four Four Two. You will receive a verification email shortly.
There was a problem. Please refresh the page and try again.