Though Kim Kardashian stayed home with her newborn daughter, her mom, Kris Jenner, and sister Kendall, were there to watch her blow out 16 candles on a cream-colored birthday cake.
Also in attendance were Kylie's other half-sisters, Khloe and Kourtney Kardashian, and E! cameras filming for "Keeping Up With the Kardashians."
"16 haaaay," Kylie tweeted on Saturday. "Love everyone who called and saw me at midnight! Got the best friends & family!"
Though Kim couldn't make it to the festivities, she shared a collage of family photos featuring her "muse & baby sis" Kylie.
"Sixteen years old is a little crazy!" Kourtney said on Instagram.
"Happy birthday to my sweet sweet @kyliejenner," Khloe said. "No one could ever understand the bond we have and I love that! We understand our weirdness and that's love man!"
"Happy birthday to my crazy, beautiful, wild little sister" Kendall, 17, wrote of her partner in crime. "Can't believe you're turning 16! I love you and don't know what I would do without you! have an amazing day! lets party!"