The star of "High Society," "Dial M for Murder" and "Rear Window" married Prince Rainier III in 1962, becoming Princess Grace. She died after suffering a stroke and crashing her car in 1982 at age 52.
Prince Albert II and his sisters -- Princesses Caroline and Stephanie -- released a statement in response to producers' claims the royal family supported "Grace of Monaco," the BBC reported.
"The Princely family wishes to emphasize that this film is by no means a bio-pic," the statement said. "It recounts one rewritten and needlessly 'glamorized' page in the history of the Principality of Monaco and its family. ... The Palace of Monaco cannot accept that the producers of this film imply they have received their Highnesses' support in any way whatsoever, since this is not the case."
The statement said the movie contains "major historical untruths and a series of purely fictional scenes," the BBC said.
"Grace of Monaco," due for theatrical release in 2014, is directed by Oliver Dahan, whose credits include "La vie en rose," the 2007 biography of singer Edith Piaf.