Cole Sprouse, Lili Reinhart, Skeet Ulrich, Madchen Amick and Marisol Nichols all expressed support for their co-star via Instagram. Perry's rep says he's under observation at a hospital.
TOPICS: Luke Perry, The CW, Riverdale, Cole Sprouse, Lili Reinhart, Mädchen Amick, Marisol Nichols, Skeet Ulrich