Lawrence donned a pale, strapless Dior Haute Couture gown for the ceremony, where she is up for her role in Silver Linings Playbook.
The actress shared with E! Online's Ryan Seacrest that she is "starving" as she has been too busy to eat before the show.
She said: "Today was stressful and I had no time to eat. I am starving Is there food here?
"Aw, the show is so long. Sorry! I'm so upset about the food!"
The 85th Academy Awards continues on ABC.
Oscars 2013 - 85th Academy Awards ceremony highlights:
Copyright: PA Images Chris Pizzello / AP