Shocking only in a "we're surprised it took this long," TMZ.com is facing a lawsuit from Anna Nicole Smith's mother, Virgie Arthur, on charges of libel. Namely, she says an April story on the site, which claimed she had a relationship with her stepbrother, hurt Virgie's chances of gaining custody of Anna's daughter Dannietlynn. Along with TMZ, three other bloggers were named in the suit, including a one Lyndal Harrington, whose blog we cannot find on The Google. (Maybe this is it?) Court docs are here.