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Turning lemons into lemonade.

Teresa Giudice is only a month into her 15-month prison sentence for fraud, but she's already planning on turning her life behind bars into something positive ... maybe even a best seller.

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The reality-star-turned-jailbird is reportedly planning on writing a memoir about her locked-up life. Life & Style is reporting that the book would essentially detail her day-to-day activities in the Federal Correctional Institution in Danbury, Conn.

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At least one alleged expert thinks the book could rake her in a tidy little sum.

"She'd probably get anywhere between $200,000 to $1 million for a book," Strategic Vision CEO David Johnson told the magazine. "She'll be quite marketable."

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The "Real Housewives of New Jersey" star has already written four cookbooks, three of which were New York Times Best Sellers.

"She's gonna cash in no matter what," the Strategic Vision CEO said. "For speaking engagements, she could get $5K to $20K per gig. What she needs to do is talk about what she's learned."