Note that the uploaded photo is a larger, better quality cropped copy than the one shown in the newspaper.
A search for original registrations was done in both artwork and periodicals for the year 1957. There were no listings for Associated Press-Marilyn Monroe in artwork and no listings for the Terre Haute Tribune in publications. There's no evidence of original copyright here.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
{{Information |Description=Photo of Marilyn Monroe from the April in Paris Ball held at the Waldorf-Astoria in New York in 1957. |Source=[http://www.newspapers.com/clip/1590264/marilyn_invited_to_april_in_paris_ball/ The Terre Haute Tribune] page 1 |Da...