Poison frontman and Celebrity Apprentice finalist Bret Michaels is back in a Los Angeles hospital, after suffering what doctors are calling a "warning stroke." A note posted on Michaels' website said he was experiencing "numbness on the left side of his body, predominantly his face and hands." Tests have revealed that Michaels has a hole in his heart. Michaels' doctor said this condition is unrelated to the brain hemorrhage Michaels suffered a few weeks ago. NBC had hoped that the singer would appear on Sunday's season finale of Celebrity Apprentice.