At one point during the reality star's party, pink and gold confetti ... Kylie Jenner is 21! The youngest of the KarJenner clan celebrated her milestone birthday at Delilah, a restaurant-lounge ...

"Guess who's 21 bitches," she wrote over the selfie. She then proceeded to go out and celebrate. Sami posted a photo of her pink frosted birthday cake with 21 metallic pink birthday candles ...

Sami posted a photo of her pink frosted birthday cake with 21 metallic pink birthday candles ... where she posted a black-and ...