GWEN'S GOT NO BEEF WITH SLIMMER BLAKE!

ONCE blubbery Blake Shelton is suddenly looking much slimmer — and pals dish the country heavyweight finally ditched his doughboy diet because fed-up wife Gwen Stefani banned him from their bed until he lost some lard!

According to insiders, the God’s Country singer, 47, dropped as much as 20 pounds by eating lean proteins, veggies and fruits — and even cut back on beer after his fit duet partner laid down the law!