Bristol Palin joins "Teen Mom OG"; behind the scenes of "Captain Marvel" with Brie Larson; Kyle Richards and Jamie Lee Curtis ("Halloween") reunion; the memory that keeps Jamie Lee Curtis up at night; James Corden ("Smallfoot"); the new reboot of "Magnum P.I."; Demi Lovato's mother; Justin Bieber's serenade to Hailey Baldwin at Buckingham Palace; "America's Got Talent" season finale;—anonymous