Alison Carey, a former prostitute who is HIV positive, reportedly returned to her old ways on Friday, when she was busted in Saugerties as part of an undercover operation.
According to The Daily Freeman paper, Alison had been using a local hotel for the past week while working as a prostitute, allegedly posting her information online.
Authorities received a tip off about the sex ads, which referenced her superstar sister's hit song Fantasy, and launched an investigation, which resulted in the sting.
A Friday night ad reportedly posted by Alison read: "Im (sic) a pretty lady looking for guys who are looking to have some fun and get into a world of pleasure that other woman just cant provide two (sic) you, woman with the ability to make the earth move for you and to get you to see stars."
"Oh yea with me its (sic), 'ITS SUCH A SWEET, SWEET FANTASY BABY, WHEN I CLOSE MY EYES I COME AND TAKE YOU ON AND ON,'" she added.
The 55-year-old was busted after approaching an undercover police officer, who had posed as a customer, and offering up sexual favours in exchange for cash.
She was arraigned in Saugerties Town Court and is currently being held on $1,000 (about R14 423) bail at Ulster County Jail, ahead of a court hearing on Tuesday.
Alison reportedly told arresting officers she was Mariah's sibling as she was being taken into custody, and her identity was confirmed with an Internet search by Saugerties police chief Joseph Sinagra.
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Cops have appealed to anyone who may have had sexual contact with Alison to seek medical testing.
Mariah has yet to comment on her sibling's arrest. She has been estranged from Alison and their brother Morgan for some time, and didn't respond earlier this year when they launched a desperate appeal for the singer to reach out, amid claims Alison was dying. She was reportedly in need of brain and spinal surgery, while she was diagnosed with liver cancer in 2012.
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