Marc Anthony's Miss Universe ex-wife has been living off the singer's gravy train for eight years -- because ever since the former couple divorced ... Marc's been paying her a staggering $16,500 per month in alimony and child support. 

A judge in the Dominican Republic issued the alimony and child support order in 2004 -- when the divorce was finalized -- and now, for the first time, the order has been made public.

Marc's ex Dayanara Torres -- who recently moved to the U.S. -- had to file the order in an L.A. court so that she can enforce it on her new home turf.