For years, the hottest seat on Disney Cruise Line ships has been a table for two in the hard-to-get 7 pm slot at Remy, the fabulous French adults-only restaurant. A close second is a coveted cabana on Castaway Cay, the line’s private island. (These sell out weeks before most sailings.) But now there’s a third enviable booking: A predinner appointment at the Bibbidi Bobbidi Boutique, Disney’s beauty parlor for kids, which opened at the end of October 2015 on Disney Dream.