The newly 17-year-old reality star rocked all black for the big event and Kendall even matched with her.
That same day, Kendall took to Instagram to wish her sister a happy birthday.
“happy birthday to my teeny tiny baby sister @kyliejenner I love you,” she captioned the adorable throwback photo of the two.
FYI: Kylie is wearing a Stone Cold Fox dress.
15+ pics inside…