Here is a portion of the Tribune story:
Marilyn Monroe got an overnight tattoo, courtesy of an unknown vandal.
The 26-foot-tall statue of the screen legend continued to draw gawkers to North Michigan Avenue Saturday, some of whom posed smiling for pictures next to an ink message, apparently scrawled with a marker of some kind on the back of her right calf.
The graffiti appears to include the words “Pi$tola” and “Ariel” with a heart between them, along with other doodles.
Witnesses noticed the damage to Monroe Saturday morning and informed police, who are investigating.
Read the entire Tribune story here: http://www.chicagotribune.com/news/local/breaking/chi-marilyn-monroe-statue-chicago-defaced-graffiti-20110827,0,2528780.story