Bollywood celebs served major Halloween inspiration over the years with their stunning transformations. Sonam Kapoor oozed old-Hollywood charm as Marilyn Monroe, while Janhvi Kapoor went darkly glamorous as Morticia Addams. Katrina Kaif brought Harley Quinn's chaos to life, and Shanaya Kapoor dazzled as Princess Mia Thermopolis, each look truly unforgettable.