Demi Moore is turning heads. On Tuesday, The Substance actress made an appearance at the 2026 Cannes Film Festival in France, wearing a strapless Jacquemus gown and luxurious diamond Chopard necklace. See (below): (c) MEGA/WENN (c) MEGA/WENN (c) MEGA/WENN (c) MEGA/WENN View this post on Instagram A post shared by Brad Goreski (@bradgoreski) Related: Fans Concerned Over Ryan Seacrest's 'Extensive' Weight Loss In New Pics However, the conversation quickly shifted from her glamorous gown as fans began to express concern, with many making comments speculating about her health.