Amy Winehouse’s junkie husband, Blake Fielder-Civil has been cheating on Winehouse behind bars! Blake sworn his undying love to a secret mistress — and vowed to run away with her and a chunk of the singer’s fortune. Too bad it wasn’t with an inmate!

photo: PR Photos

Jobless Jailbird BLAKE FIELDER-CIVIL, 25, has been plotting with the mystery blonde during a string of hush-hush prison visits.