The 17-year-old daughter of Witherspoon and Ryan Phillippe n an olive top and a multicolored, tweed Chanel skirt for the event, reported E! online.
She completed her look with a sequin gray Chanel mini purse and black strappy sandals.
Witherspoon recently gushed about her daughter saying she is proud of her.
"She's just a sweetheart. And just a nice young woman who's turned out to have this huge heart and soul and, I'm just so proud of her," she said.