Casey Anthony has been keeping a journal ever since she was locked up for murder, and there's a possibility it could be used as evidence against her.
Not for killing Caylee, of course - that ship has sailed after a jury acquitted her last July - but in the defamation suit filed by Zenaida Gonzalez.
Gonzalez is suing because the notorious “Tot Mom” told cops that a woman with a similar name to Gonzalez - Zanny the Nanny - kidnapped Caylee.
Whether her journals and the Casey Anthony video diaries stay hidden is an open question, as lawyers believe Zenaida is mentioned in them.
"That is relevant information a jury needs to hear," a source close to the situation said. "Zenaida's lawyers could ask that Casey's journals be admitted."
"It's expected that Casey's attorneys will vehemently oppose that line of questioning and any action to get Casey's journals in front of the jury."
A jury of six must come to a unanimous decision on a verdict under Florida law in the civil trial to establish whether Anthony defamed Gonzalez.
Anthony, who had been in laying low while she serves her probation for check fraud, has since subpoenaed and is out of hiding and on the run.