Don’t think she ever had one.
She may never have had one. That's one of those Internet rumors that people repeat and nobody's ever confirmed. It's never been photographed.
Apparently the source is Humberto Fontova, a Cuban emigre, who probably knows more about Guevara and Castro than about Angie and Brad.
Angelina said she had a tattoo of Brad somewhere on her body but wouldn't say where, and people started saying that about a Che tattoo, so the rumor's a little suspicious.
Mike Tyson's another matter, though ...