He reportedly left his house in Malibu -- the couple separated last year -- to accompany Kris.
A source told E! News that Kris, 58, had complained of "internal pains," but would not be more specific.
"I'm feeling well and looking forward to a relaxing Easter holiday," she said later.
Jenner seems to have recovered in time to celebrate Easter weekend with her grandkids. She tweeted a photo of her seasonal decorations captioned, "Easter sweets and goodies for my precious Bunnies!! #EasterLove."