18,000 Take it off for art

More than 18,000 people stripped down and bared it all in a Mexico City square Sunday for U.S. photographer Spencer Tunick's biggest nude shoot ever.

"I think all eyes are looking south from the United Sates to Mexico City to see how a country can be free and treat the naked body as art. Not as pornography or as a crime, but with happiness and caring." Tunick said at a press conference afterwards.