"Jill put on a brave face at Bloomingdale's Makeup Date 2017 event," an insider at the event told RadarOnline.com. "Jill was holding back tears and looked worried and scared."
"I asked her how Bobby was doing and she said he was back in the hospital and she didn't want to leave his side," the insider added. "Jill has been by Bobby's side 24/7 since his cancer took a turn for the worse and she said it was hard to leave for the 45 minute appearance, but Bobby insisted that she go."
"She said Bobby encouraged her to step away and honor her commitment to Bloomingdale's, but it was very hard for her," the insider noted. "She said the past few weeks have been a roller coaster of good days and bad days and that the family is taking things day by day."
"Jill said that she was going back to the hospital after the event and she seemed very worried about Bobby," the insider said. "She thanked the audience for their love, support and prayers during this difficult time."
"Bobby is everything to Jill and she prays every day for a miracle," the insider concluded.
RadarOnline.com previously reported that Bobby, 71, was diagnosed with thyroid cancer in 2009, and Jill, 53, revealed that the diagnosis "took an unexpected turn" earlier this year.
"Jill and Bobby have an incredible support system of family, friends and fans that have rallied around them," a source close to the family recently told RadarOnline.com. "It's very sad. Friends and family don't know what's going to happen and they are all very worried and scared."