Titanic in her outfit for Leonardo DiCaprio’s 49th birthday party.The actor was seen dressed for the Beverly Hills party on Saturday (November 11) with a supersized blue gem necklace hung around her waist, which some fans have assumed is meant to resemble the Heart of the Ocean diamond featured in the 1997 film.In a comment on Fashion Bomb Daily’s Instagram post showing Beckinsale’s outfit, one user wrote: “But I thought the old lady dropped it into the ocean in the end?”A post shared by Kate Beckinsale (@katebeckinsale)Another user wrote: “The heart of the ocean is what I see. It’s cute and unique.”Beckinsale’s outfit, however, might be a reference to a necklace featured in 2004’s The Aviator, a film she starred in opposite DiCaprio.