"Jaden meeting Kylie and Kendall at their meet&greet in Santa Monica! So cute," tweeted a fan, along with the photo.
Kylie, 15, and her sister, Kendall Jenner, 17, were busy meeting fans and promoting their clothing range, PacSun, when Jaden dropped by. The girls were at their new Santa Monica store which sits on the oceanfront of California's popular coastal city.
Jaden Smith, 14, opened up about his relationship with Keeping Up With the Kardashians star Kylie for the first time in April.
Jaden, who is the son of actors Will Smith and Jada Pinkett-Smith, described their romance as "pretty awesome".
"She's one of my best friends," the young rapper said of his budding model love in an interview. "I was in LA, we were all hanging out. Then I went to New York and she came too, then she came here and surprised me, so that's pretty baller."
The Karate Kid actor's confirmation of their blossoming romance comes after 15-year-old Kylie, Kim Kardashian's half-sister, was spotted at a Justin Bieber concert in London in March where Jayden performed as one of the opening acts.
On the same weekend the young couple were seen out and about together at various locations in the capital. One evening Jaden's dad, Men In Black star Will Smith accompanied the pair to top sushi restaurant Nobu. They also enjoyed a solo dinner date in Covent Garden and a low-key lunch at Café Nero.
It's not just Jaden and Kylie who have been spending time together. Their two famous families have crossed paths on numerous occasions. Kylie was seen with Jaden's younger sister Willow Smith in a toy shop in New York in February. Kendall has described Jayden as like a "little brother".
Jaden is following in the footsteps of his famous parents. His music career was boosted when he featured on Never Say Never with Justin Bieber. Jaden will be back on our screens when he stars alongside his father in After Earth, a sci-fi epic due out in June.
He remained vague about his plans for the future. Over the next few months he said he'd be "hanging out, finishing the CoolTape Volume Two [his new album], maybe going to Italy, and yeah, just coolin' it."