"I think it's going to take 45 to 46 fittings and I have a rough idea on the dress," J. Law said. "It's very exciting."
While the opportunity is one that many would die for, J. Law explained how she almost let the chance of a lifetime slip by her.
"I got an email and I didn't reply to it because I never do, and then I started getting pressure to respond," she said. "Then I was like, 'Yes! I'd love to!' and I really didn't know what I said yes to, and now that I know what I said yes to, I'm thrilled."
Last year, her friend and Silver Linings Playbook co-star Bradley Cooper co-chaired the event with Sarah Jessica Parker. She revealed the practical advice the American Sniper star had to share.