Prisoners being housed with Amy Winehouse’s currently incarcerated hubby, Blake Fielder-Civil, are threatening to kidnap the beehived Brit for $100,000 ransom.

“Blake’s petrified. He’s living in fear for Amy’s life AND his own,” according to British tabloid spies.

“At first he thought the guys in here were just trying their luck but the threats have got really bad. He’s now under no illusions and convinced they’ll go through with what they say.”

“They’ve ordered Blake to pay the 100 grand into a secret bank account within the next few days or else…Amy will be snatched and harmed.”

“Blake knows it’ll be easy to bundle her off in a car without anyone batting an eyelid.”