Stepping out to support a fellow teen celeb, Jaden and Willow Smith attended Kylie Jenner's Sweet 16 birthday party at the AT&T Center in Los Angeles on Saturday (August 17).

The "Karate Kid" star kept it simple in a black sleeveless shirt, black shorts, and matching sneakers while his songstress sister was all smiles in a white midriff-baring top, black blazer, and pink shorts.

Last week, the young reality star had a small celebration with her family (minus Kim and baby North) at Nobu restaurant in Malibu.

In addition to the fam, Jaden was also in attendance, fueling rumors that the two are in a relationship. After that evening, Kylie wrote, "Thank you to everyone for the bday wishes and making yesterday so special! Blessed! Honestly had the most amazing night."