Julia Roberts and Mahershala Ali sit down with “Extra’s” Adam Glassman to talk “Leave the World Behind,” their new movie about a cyberattack that marks the end of the world as we know it. Julia also dished on her sweet Instagram tribute to her twins, Hazel and Phinnaeus, as they turned 19! Plus, in a bizarre twist of fate, the movie features the sitcom “Friends,” which Julia gueststarred on. She and Mahershala reflected on the passing of Matthew Perry and the sweet timing of this little tribute. “Leave the World Behind” is streaming on Netflix December 8.