See what Aaron Hernandaz does to pass time in jail

Aaron Hernandez must be pretty bored in prison, because he is passing the time by drawing naked big-booty ladies in jail, and TMZ has obtained one of his drawings.

Hernandez sent the letter off to a male penpal right before Thanksgiving, and after going on about how he's still innocent, and still not sweating the murder charge, and that he will get out soon, and what he will do when he gets out, he signed his letter with a sketch of a naked female.

If you take a close look at the drawing it seems Hernandez wrote on her back, "I need a**," well if that's the case, it sure is going to be a long time till that happens.

In the letter Hernandez also mentions he likes to read, and that he has read at least 25 books. Think that will make everyone feel better if he just reads, instead of trying to be an artist.

He included a caption: "Dats a bad b**** lol."

He also says, "Please keep private, I know you will, just sayin!" Just a little reminder Hernandez, nothing is private in jail!

We wonder if the penpal wrote back.