Singer Rihanna (C), flanked by Japanese actor Tadanobu Asada (L) and U.S. director Peter Berg, wears a cap during a news conference to promote their film "Battleship" atop a flight deck of aircraft carrier USS George Washington at Yokosuka port, south of Tokyo April 2, 2012.[Photo/Agencies]

Actress and U.S. model Brooklyn Decker attends a news conference to promote the film "Battleship" atop a flight deck of aircraft carrier USS George Washington at Yokosuka port, south of Tokyo April 2, 2012.[Photo/Agencies]