After being spotted out together, fans are wondering: Who is Kendall Jenner’s boyfriend, Devin Booker? While neither has confirmed the relationship, it’s possible that the 24-year-old Keeping Up With the Kardashians star might be dating the 23-year-old NBA player—the pair have been exchanging flirty comments on Instagram, and most recently, they decided to step out together for a dinner date with Kendall’s sister, 23-year-old Kylie Jenner.