Kylie Jenner's official birthday may have been Sunday. But the Keeping Up With the Kardashians star couldn't help but begin the celebrations early.
According to a source, Tyga hosted a 17th birthday party for the young fashionista out in Calabasas, Calif., on Saturday night. Sister Kendall Jenner, Chris Brown, Jaden Smith, Justin Bieber and other friends were among those in attendance.
"Happy Birthday @KylieJenner," Bieber shared on Instagram after the party. "Glad I got to spend it with u. So dope watching u grow up."
Turns out it was only the beginning of a jam-packed weekend.