Jane Fonda at the 2026 Cannes Film Festival. Pascal Le Segretain/Getty Images The Cannes Film Festival is underway in France between May 12 and May 23. Stars like Jane Fonda and Demi Moore have already attended in glamorous outfits. Others, like Heidi Klum, missed the mark with their red-carpet fashion. The red carpet has officially been rolled out in Cannes, France. Celebrities are flocking to the resort city this week to celebrate the Cannes Film Festival , which showcases new films and promotes highly anticipated projects from around the world. Naturally, many attendees have already made red-carpet appearances in showstopping fashion, from elegant ensembles to daring looks that push the Cannes Film Festival dress code . These are the best and worst outfits we've seen so far. Demi Moore had a princess moment in a shimmering gown at the festival's opening ceremony. Demi Moore at the 2026 Cannes Film Festival.…