The True Grit star marked the milestone on 11 December (12) and she celebrated by hosting a glitzy bash at L.A.'s Rolling Stone Restaurant and Lounge for friends including Will Smith's singer daughter Willow and actress/singer Victoria Justice.
The Hunger Games star Jacqueline Emerson, 18, also attended the party, where the young guests were treated to manicures and non-alcoholic cocktails.
Steinfeld posted pictures of the party online and thanked her guests for turning out. In a series of posts on Twitter.com, she writes, ""Wish last night never ended!... Thanks for the awesome sweet 16 party!!!""