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. Last Updated: 07/27/2016

18,000 Nudes Fill Main Square in Mexico City

MEXICO CITY, Mexico -- Carmen Gonzalez stood prim and proper Sunday in the predawn darkness of this city's grand central square.

Her dark brown dress was neatly pressed, and she held her daughter's hand tightly as the crowd pressed against them. This isn't Gonzalez's "thing," hanging around at a crazy hour, preparing to get a little wild. But at the age of 50, she figured, "Why not?"

Why not get naked?

"I'm nervous," Gonzalez told her daughter, Maria Oliva Gonzalez, 20, as a voice crackled over the loudspeaker.

But when Spencer Tunick, provocative photographer of the bare-bunned masses, gave the word, Carmen Gonzalez did not hesitate.

And there it was. After a lifetime of acting demure, Carmen Gonzalez was naked for all to see. Everyone was smiling -- an estimated 18,000 to 20,000 volunteer nude models hopping about in the morning chill, blowing away Tunick's previous record of 7,000, set in 2003 in Barcelona.

Tunick, a New Yorker, has been arrested multiple times since he began staging large-scale nude photo shoots in the early 1990s.

He has posed nudes in front of a statue of Simon Bolivar in Caracas, Venezuela, filled the streets of Montreal and Sao Paulo, Brazil, with them and marched them through a London department store.