Tyga asked Bieber to serenade the nymphet, he purchased birthday party hats emblazoned with Kylie's picture, and he ordered a custom made cake that was shaped like a large erect penis.
After the festivities, the 17-year-old posted on her Instagram account, "Thank u everyone & T for the [large erect penis] cake & JB for singing happy bday to me. I love u guys."