The stars came out for the March of Dimes Celebration of Babies Hollywood luncheon in LA on Friday, with celebrities like Jennifer Lopez, Reese Witherspoon, and Josh Duhamel honoring the group's cause. March of Dimes is a nonprofit organization for pregnancy and baby health, and Friday's event recognized famous faces in entertainment whom March of Dimes considers to be role models for parents and children. Reese Witherspoon served as one of the host committee members, with honorees J Lo, President and CEO of A&E Networks Nancy Dubuc, Dr. Balaji Govindaswami from Santa Clara Valley Medical Center, and President of Universal Pictures Jimmy Horowitz. J Lo said of her award, "I am thrilled and honored to be receiving the March of Dimes Grace Kelly Award and to continue her legacy of compassion for mothers and children." Nick Cannon was the master of ceremonies, and other stars in attendance included Hollywood dads Mark-Paul Gosselaar and Chris Pratt, plus moms Molly Sims and Tia Mowry.