Kylie Jenner and Timothée Chalamet are thinking about what's ahead three years into their romance. The reality star, 28, and Marty Supreme actor, 30, are "very serious and committed to each other," an insider exclusively tells Us Weekly. "Their relationship is very strong and they have a good rhythm going." Jenner, for her part, recently said that she wanted to spend the last years of her 20s focusing on "me, my businesses, my work" as well as traveling and "enjoying my kids" during an interview with Vanity Fair published on March 11. "And then, I do want to have more kids.