In an outrageous slap-in-the-face to the justice system, vicious killer Joran van der Sloot was caught with a woman in his cell – preparing for a wild sex-and-drugs party.

Despite facing a murder trial, Joran was able to use a fistful of money and Spanish sweet talk he’s learned since his arrest in Peru to lure an attractive 2 5 – year- old brunette visitor away from a jail mate, The ENQUIRER has learned exclusively.

The incident delivered another blow to the heartbroken family of Stephany Flores, the 21-year-old student Joran has admitted battering and smother­ing to death in his Lima hotel room in May 2010.

The astonishing seduction scene unfolded on one of the two days a week when only female visitors are allowed into Lima’s law­less Miguel Castro Castro prison.

“Joran was given permis­sion to leave his cell to buy a soda from an inmate shop in an adjoining wing, where convicted foreign prisoners are housed,” a source told The ENQUIRER.

“There he met a woman who regularly visits another inmate to have sex and bring him drugs after guards have been bribed to look the other way. Joran began chatting with her, but unluckily for him he was spotted by one of the few incor­ruptible staffers.

“The guard became suspicious when he saw Joran whisper in the woman’s ear, then slip her money before strolling back to his own cellblock.

“A few minutes later, the guard saw the woman walk in the same direction. He followed her at a discreet distance – and watched her step inside Joran’s cell.

“Before they could begin having sex, the guard burst in and broke up the party.

“Joran started yelling, threw something under his bed and tried to push the guard out of the cell – but the staff member called for reinforcements.

“When guards subdued Joran, they looked under the bed and found packets of marijuana and a powerful, hallucinogenic cocaine base that users smoke.

“The woman confessed she’d just sold them to him.”

ALL the details are only in the new ENQUIRER!