Sean Penn and Charlize Theron attend The Metropolitan Museum of Art's Costume Institute benefit gala celebrating "Charles James: Beyond Fashion" on Monday, May 5, 2014, in New York. (Photo by Evan Agostini/Invision/AP)

Sean Penn (L) and Charlize Theron (R) arrive at the Costume Institute Benefit at The Metropolitan Museum of Art May 5, 2014 in New York. AFP PHOTO/Timothy A. CLARY

Sean Penn (L) and Charlize Theron (R) arrive at the Costume Institute Benefit at The Metropolitan Museum of Art May 5, 2014 in New York. AFP PHOTO/Timothy A. CLARY

Sean Penn (L) and Charlize Theron arrive at the Costume Institute Benefit at The Metropolitan Museum of Art May 5, 2014 in New York. AFP PHOTO/Timothy A. CLARY

Sean Penn (L) and Charlize Theron (R) arrive at the Costume Institute Benefit at The Metropolitan Museum of Art May 5, 2014 in New York. AFP PHOTO/Timothy A. CLARY

Sean Penn (L) and Charlize Theron (R) arrive at the Costume Institute Benefit at The Metropolitan Museum of Art May 5, 2014 in New York. AFP PHOTO/Timothy A. CLARY

Pictured: Charlize Theron and Sean Penn Mandatory Credit ?? Gilbert Flores/Broadimage 2014 Costume Institute Benefit celebrating the opening of Charles James: Beyond Fashion 5/5/14, New York, New York, United States of America Broadimage Newswire Los Angeles 1+ (310) 301-1027 New York 1+ (646) 827-9134 sales@broadimage.com http://www.broadimage.com

Pictured: Charlize Theron and Sean Penn Mandatory Credit ?? Gilbert Flores/Broadimage 2014 Costume Institute Benefit celebrating the opening of Charles James: Beyond Fashion 5/5/14, New York, New York, United States of America Broadimage Newswire Los Angeles 1+ (310) 301-1027 New York 1+ (646) 827-9134 sales@broadimage.com http://www.broadimage.com

Sean Penn, left, and Charlize Theron attend The Metropolitan Museum of Art's Costume Institute benefit gala celebrating "Charles James: Beyond Fashion" on Monday, May 5, 2014, in New York. (Photo by Evan Agostini/Invision/AP)

Pictured: Charlize Theron, Sean Penn Mandatory Credit ?? Jack Shea/Starshots/Broadimage "Charles James: Beyond Fashion" Costume Institute Gala - Arrivals 5/5/14, New York, New York, United States of America Broadimage Newswire Los Angeles 1+ (310) 301-1027 New York 1+ (646) 827-9134 sales@broadimage.com http://www.broadimage.com