Justin Timberlake is adding Rick Rubin to the list of collaborators for his sophomore release as a solo artist. Already signed on to the twelve-track LP are Timbaland and Will.I.Am of the Black Eyed Peas. The singer is planning to continue work on the album through the spring with the hopes of a summer release. Since his debut Justified, Timberlake has focused primarily on acting, shooting Edison, Black Snake Moan, and Alpha Dog. http://www.mtv.com/news/articles/1519771/20060105/timberlake_justin.jhtml?headlines=true