As if this show weren't already a cornucopia of gay icons, Ellen DeGeneres has just been tapped to host VH1's Divas Las Vegas concert at the MGM Grand on May 23. (FYI: the Divas shows have never before had a host.) As previously reported, the stunning talent lineup includes Celine Dion, Cher, Mary J. Blige, The Dixie Chicks, Shakira and Stevie Nicks.