Willow Smith: Hailee Steinfeld's Sweet 16!

Willow Smith suits up to party with birthday girl Hailee Steinfeld at Rolling Stone Lounge and Restaurant in Hollywood on Saturday night (December 15).

The 11-year-old pop star joined Victoria Justice, Kiernan Shipka, Adam Irigoyen, Caroline Sunshine, Amandla Stenberg, Jacqueline Emerson and many others at the bash!

PHOTOS: Check out the latest pics of Willow Smith

Guests at Hailee‘s party toasted with vitaminwater mocktails including the citrus refresher made with vitaminwater multi-v, cranberry juice, seltzer and lemon and were also treated to Sally Hansen InstaGel manicures.