Will Ferrell dropped by the taping of Samantha Bee’s Not the White House Correspondents’ Dinner, to air on TBS tonight. “It’s not a party without a special guest,” Bee’s Full Frontal just tweeted, showing Ferrell in all his W glory. In another tweet (see them below), Ferrell holds up a very W-like painting. Full Frontal‘s Not the White House Correspondents’ Dinner airs tonight at 10 pm ET on TBS. In a brief interview on MSNBC this afternoon, Bee said she and Full Frontal…