Blond beauty Megan Breen tasted forbidden fruit behind prison walls after embarking on a torrid affair with a jailbird.

And now she’s discovered the bitter aftertaste.

The 23-year-old British corrections officer pleaded guilty to sordid sexual encounters with the unnamed prisoner at two different jails. The “inappropriate relationship” lasted more than three months.

Breen had been employed at His Majesty’s Prison Usk and His Majesty’s Prison Prescoed. Both jails are in Gwent, South Wales.

Initially, Breen had denied the hormone-charged hijinks, but late Monday she changed her plea to guilty. Charges of illegally accessing a computer were dropped. She was given bail but warned she faces prison when she is sentenced in September.

The charge states that Breen — while acting as a public o

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