Casey Anthony claims the videos that leaked onto the Internet last week were stolen from her computer by a malicious hacker ... this according to her probation officer.

According to the Florida Department of Corrections, Casey made the claim during a recent meeting with her P.O. ... insisting someone illegally downloaded the clips off of her personal machine and then posted them on YouTube (below).

As we previously reported, the videos show Casey talking to herself about pretty mundane things -- adopting a dog, new piercings ... nothing that embarrassing ... but according to the docs, Casey's real pissed the videos were stolen.

Casey is currently serving a year of probation in Florida for check fraud.

See also

Casey Anthony's Attorney -- We're Going After Whoever Leaked Private Videos

New Casey Anthony Video & Photos Surface

Casey Anthony Is a 'Teen Mom'?

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