When "Silver Linings Playbook" star Jennifer Lawrence was accepting Outstanding Female Actor in a Leading Role at the 2013 SAG Awards on Sunday night, she remembered her first role: a television commercial for "My Super Sweet 16."

"I want to thank MTV," Lawrence said. "I'll explain that. I earned my SAG card when I was 14. I did an MTV promo for 'My Super Sweet 16.' And I remember getting it in the mail and it being the best day of my entire life, because it officially made me a professional actor, which put me in the category with all of you."

Lawrence was nominated in the category alongside Jessica Chastain, Marion Cotillard, Naomi Watts and Helen Mirren; she's the favorite to win Best Actress at the 85th annual Academy Awards on Feb. 24.

Watch Lawrence's lost MTV promos above. Check out her full SAG Awards acceptance speech by clicking here.

For a full SAG Awards report, check out HuffPost Entertainment's SAG coverage.