Sadly, our city's brief affair with Leonardo DiCaprio is about to end. With filming on "Body of Lies" all wrapped up in Washington, Leo will be checking out of the Presidential Suite at the Ritz Carlton Georgetown early Friday morning.
    And now that his stay is over, we hear that his alias at the Ritz was ... Daniel Buckman. (Could he be borrowing the name of the novelist behind such books as "The Names of Rivers" and "Water in Darkness"?)
    Unless someone sees him bright and early Friday (and please let us know) our final Leo sighting in Georgetown is this: he was seen Thursday in the front seat of a black Lexus SUV heading up Wisconsin Avenue.
    Godspeed, Leo.