American actress Nikki Reed has helped launch Lindt's sixth Gold Bunny Celebrity Auction in the US to benefit the world's leading autism science and advocacy organisation, Autism Speaks.

Scarlett Johansson, Blake Lively, Blake Shelton, Kelly Clarkson, Owen Wilson and Sherri Shepherd are among over 60 celebrities who've donated autographs, which people can be bid on until March 20 at lindtgoldbunnyauction.com.