TiVo Alert - It's appointment TV time, as the Ab Fab girls travel to NYC to find Edina's long-lost favorite son Serge (played by House of Yes's Josh Hamilton). With a nod to the show's most faithful demographic, the prodigal turns out to be a closet case whose been hiding from his mother all these years, not exploring Antarctica or the deep sea floor as Edina believed. BBC has a run-down of some of the cameos, but neglects to mention an appearance by a certain former First Daughter.