Kylie Jenner's been dating Jaden Smith for several months, but could the two have another young couple to double with? As in Kendall Jenner and Young Jinsu! An insider says the 17-year-old model and the 21-year-old rapper are dating. It's been at least a few months, they've been getting closer recently, and they've been hanging out all the time. But Kendall isn't fessing up to anything just yet. She tweeted, "enough with the rumors! I'm single, people." Ok! We'll take your word for it!