Final answer:
Jean-Paul Gaultier is the French designer responsible for Demi Moore's Little Black Dress in 'Indecent Proposal,' as well as collaborations with Beyoncé and Cirque du Soleil.
Step-by-step explanation:
The French designer who created the iconic Little Black Dress for Demi Moore in the movie 'Indecent Proposal', served as the creative and artistic director for Beyoncé's 'I Am' tour, and has collaborated with Cirque du Soleil is Jean-Paul Gaultier. Jean-Paul Gaultier is renowned for his avant-garde fashion designs and his ability to push the boundaries of traditional fashion aesthetics. His unique style has made him a favourite among celebrities and artists alike, due to his penchant for theatricality and dramatic flair in his creations.