Christopher was born on Sept. 27, 1997. While he primarily keeps private, it's known that he graduated from the University of Michigan in 2020. "Christopher, you are a champion and I love you," Arnold wrote in a celebration post on Instagram at the time, per People. "I know your graduation from Michigan wasn't the big celebration you dreamed about for years, but walking across a stage isn't what makes me so proud of you: it's your compassion, your hard work, your vision, your critical thinking, and your selflessness that make me burst with pride. I can't wait to watch you keep climbing and succeeding."
The following year, Arnold also gushed over Christopher on his birthday, writing on Instagram, "Happy birthday Christopher! I love you and I'm proud of you every day! You're so smart, and you have such a big heart. Between your boxing classes, your weightlifting classes, your stretching classes, your cycling classes, and on and on, I can't even keep up with you! I can't wait to see what you accomplish this year."
