Remember ALL THAT WEIGHT ... That Singer Reuben Studdard LOST On The BIGGEST LOSER . . . Well He Put It BACK ON!! (PICS)

American Idol singer Reuben Studdard lost more than 100 pounds - when he joined the cast of the hit show The Biggest Loser back in 2014.

And up until this year - he managed to KEEP OFF the weight.

Well check him out now - he's obviously put on MOST OF IT BACK!!