Writing matching messages on Twitter, Jaden was the first to show his feelings.
The 15-year-old actor retweeted Kylie's photo — a quote by Louise Flory talking about being fearless and living for the moment — alongside the caption, "Okay I Love This Girl".
Kylie then followed suit, retweeting Jaden's photo of an inspirational quote by Albert Einstein — which spoke about hating school — and captioned it, "Okay I love this boy."
Jaden and Kylie were rumoured to be dating last year when the celebrity couple were spotted cosying up and spending a lot of time together. Will Smith's son also celebrated Kylie's sweet 16 with the birthday girl and the rest of the Kardashian clan.
Kylie has previously slammed reports that her mother Kris Jenner forces her to date high-profile men, tweeting that she couldn't believe "that some people actually believe I would waste my time dating someone as a publicity stunt."
Last December, the brunette beauty revealed that she didn't have a boyfriend but would like to go to prom with one of her "best guy friends" like Jaden.
"I know I'd have fun with him," Kylie told Seventeen. "He makes me laugh and he is a great dancer."