Barbra Streisand has worried fans after her unusual appearance at this year's Cannes Film Festival . The Hollywood legend, 84, was one of three stars to be awarded a prestigious Palm D'or at the iconic event in France, but failed to attend the star-studded ceremony in person. Shortly before the glitzy gala, the Memories star released a statement saying she was unable to attend on doctor's orders due to a knee injury, immediately sparking fresh fears about the notoriously private star’s health.