Luke Perry, beloved star of the '90s classic Beverly Hills 90210 as well as the current favorite Riverdale, has suffered a "massive stroke," TMZ reports. Details are scarce, but sources say paramedics responded to a call from Perry's Sherman Oaks, Calif., home around 9:40am Wednesday and the 52-year-old was transported to a nearby hospital. His rep confirms he is currently under observation there, but did not confirm the reason. TMZ notes the news came on the same day Fox announced it's picked up a six-episode 90210 reunion series; Perry's former costars Jennie Garth, Ian Ziering, Jason Priestly, Brian Austin Green, Tori Spelling, and Gabrielle Carteris have all signed on but Perry has not, thanks to his role as Archie Andrews' dad on Riverdale. Per ET, Spelling said Perry may still appear in a few episodes. (More Luke Perry stories.)