The superstar couple is attending the White House Correspondents' Dinner -- we're hoping we will see some Pda at the big event! Robert Pattinson and Kristen Stewart are set to make one of their biggest ever appearances together -- they're both attending the April 28 White House Correspondents' Dinner in Washington, D.C.! Rob, 25, and K-Stew, 22, were both spotted in the nation's capital on April 27. Rob was caught by paparazzi cameras, while K-Stew was spotted by fans, who documented the sightings on Twitter. When asked by a fan if K-Stew was on Rob's flight, photographer Gene Young wrote, "I wont say 100% on Kristen 99.99% since I didnt see her but she was ticketed on that flight". We bet they Are together! Do You think Rob and K-Stew will show Pda at the event, HollywoodLifers? -- William Earl More K-Stew: Kristen Stewart’s New Action Movie Revealed Robert Pattinson Flies Out Of Los Angeles — Meeting Kristen Stewart?...