Miley, Reese, Courteney, Renée, and More Come Together For a Good Cause

Reese Witherspoon, Miley Cyrus, Courteney Cox, and Renée Zellweger are just some of the famous faces who stepped out at the 13th annual LA County Walk to Defeat ALS on Sunday. Miley made a surprise appearance at the event, even hopping on stage to lead a warmup session for the other 2,000 participants before the walk began. Meanwhile, Reese, Courteney, and Renée were all smiles as they posed for photos in "Team Nanci" t-shirts in honor of Nanci Ryder, the longtime Hollywood publicist who suffers from the debilitating disease. Keep reading to see more from the event, then check out these cute photos of Renée on the set of Bridget Jones's Baby.