Jennifer Aniston gets super candid in the September issue of ‘Vanity Fair,’ on newsstands Aug. 19. From talking about her ex, Brad Pitt, and the 20 years since they split, to the death of Matthew Perry. She confesses the ‘Friends’ cast had ‘been in mourning’ about their late co-star for years before his death, due to his on-and-off battle with substance abuse.