The Williams quote reads, "A prayer for the wild at heart kept in cages." She had the tattoo done after completing the film "Girl, Interrupted."
"I have a prayer for everyone when I see people who aren't living fully, who aren't happy," she told USA Today. "You can see someone in the grocery store who doesn't look as if they fit in their life, and they have a dream they're not fulfilling, and it makes me sad."
Also on that arm are a series of Roman numerals. It began with an XIII, representing the number 13, to show that the actress was not superstitious.
But maybe she is -- because she later added V MCMX -- turning it into a date: May 13, 1940.
That's the date Winston Churchill said, ""I have nothing to offer but blood, toil, tears and sweat."