Kylie Jenner and Timothée Chalamet MAke Out US Open, Other A-Listers Attend

Hollywood's heaviest hitters invaded New York City for the men's tennis final between Novak Djokovic and Daniil Medvedev at the US Open Sunday ... but there were two locking lips. The slew of A-listers -- Leonardo DiCaprio, Kylie Jenner, Timothée…