Jimmy Kimmel’s the headliner but President Obama is the star today at the White House Correspondents’ Dinner. Not that there won’t be plenty of sub-Presidential star power among the 2,700 guests at the Washington Hilton Hotel. George Clooney, Ari Emanuel, Steven Spielberg and a coterie of Hollywood heavyhitters will be mixing it up with D.C.’s political, military and media elite. Of course, there are always a few shock value guests, like Lindsay Lohan whom Greta Van Susteren invited. The fun, or fun facsimile depending on your perspective on the jokes and the politics behind them in this campaign year, begins at 3:30 PM PST/6:30 PM EST. Deadline will be live-blogging throughout … let the barbs begin!