Christina Applegate now unable to walk without a cane. Her first interview about her MS and the warning signs she missed. Then, our emotional interview with Chadwick Boseman’s widow, Simone. Plus, our new behind-the-scenes of ‘The Crown” as the cast reacts to royal controversy about this season’s Princess Diana plotline. Then, we’re with Vanessa Lachey for her big “NCIS” crossover episode. And, ET continues its Hawaii week with guest co-host Nick Lachey. What he’s telling us about the new season of “Love is Blind.”