Perez Hilton -- aka Mario Lavandeira. (Liz Kelly for washingtonpost.com) Video: Liz Quizzes Perez Aug. 17, Arlingon, Va. 10:05 p.m. It's Friday night at Clarendon ballroom and event promoters -- in this case radio station Hot 99.5 -- are buzzing the assorted journos gathered in a basement greenroom regularly to assure us that he --- Perez Hilton -- is still coming, and soon. Perez Hilton is hot. So hot that in the past month he's turned up in the realities of both Victoria Beckham (on NBC's one-hour "Welcome to America" special) and Kathy Griffin (on her Bravo show "My Life on the D List") and, for one brief shining morning, in Rosie O'Donnell's vacated "View" seat. He calls his celeb-skewering blog "Hollywood's Most-Hated Web Site" and this self-described "queen" -- who tonight is sporting haphazardly-dyed orange hair, a rumpled shirt and a shiny red tie -- is a bona...