Sean Penn's eyes lit up as he greeted Eliot Spitzer at Arianna Huffington's "Game Changers" party at Skylight Studios in SoHo the other night. The hotheaded actor and the disgraced ex-governor schmoozed like old pals amid Joel Klein, Newark mayor Cory Booker, Michael Hastings, Ground Zero mosque backer Imam Feisal Abdul Rauf, Mayor Bloomberg and Gayle King. When we asked Penn about Jessica White, his model ex-girlfriend who fought another woman over a taxi, he brushed us off, "I don't know, I haven't talked to her in so long." Penn rambled on while accepting an award from Anderson Cooper for his work in Haiti. Bloomberg flexed his pop-culture prowess when he referenced presenter Nora Ephron's book "I Remember Nothing," cracking, "Which I heard is also the title of a new book by Charlie Sheen."