Jennifer Lopez was the biggest name among the week's biggest gathering of celebrities tonight at the Voto Latino party at Vinyl nightclub. J-Lo spent about an hour at the party, sipping a White Russian and texting on her Treo. Also attending the 5280-sponsored event were Jessica Alba, Rosario Dawson, Wilmer Valderrama, Sofia Vergara, San Francisco mayor Gavin Newsom, Craigslist founder Craig Newmark, rapper Fat Joe, and Arizona governor Janet Napolitano. Oh, and of course, 5280's Naughty Pierre. Look for a full video report in the morning.