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Amy's husband, who is locked up in Pentonville prison on charges of GBH and attempting to pervert the course of justice, reportedly fears that Mark will manage to steal her heart while he is away.
The News of the World claims that Winehouse and Ronson checked into a hotel room together in the early hours of Saturday morning, following a late-night recording session.
"It's the last thing Blake needs to hear right now," a friend told the newspaper. "He's furious about how close they are."
The pal added: "Blake's fearful that Mark has much more in common with Amy than he does and is worried he'll steal her away."
Amy and Mark worked together on her best-selling 2006 album Back To Black.
