'Love & Hip Hop' couple Mendeecees Harris and Yandy Smith might be honeymooning in a federal prison ... because the groom just plead guilty to running a drug ring in upstate NY.
Harris struck a plea deal in the case, and will now face 5 to 40 years in the federal pen, and/or a fine of $5 million. The feds nailed him for a drug trafficking operation that shipped cocaine and heroin to Rochester for 7 years.
Harris will remain free on bail until his sentencing in August -- good thing for him ... since he and Yandy are getting married next month on "Love & Hip Hop Live: The Wedding." By the way, he also has to surrender all his paychecks from 'LHH.'
The only good news for Yandy -- when her hubby gets locked up ... she'll get back most of the $200k she put up for his bail when he originally got busted last year.