Kate shared a rare photo of her and Jon's sextuplets at their 20th birthday party.

Jon and Kate are in the video where he stands with his kids. Kate shared a rare photo of four of her and ex- husband Jon's youngest children on Mother's Day, two days after their 20th birthday. I know I do. The Jon & Kate Plus 8 alum shared a picture of the four siblings standing by a birthday cake with decorations. "I wish my kids a happy birthday, I can't believe they're 20," he said. Jon wished his daughter a happy 20th.