Seder Anything

S2 E21: Serena returns from her trip to Spain with Poppy (recurring guest star Tamara Feldman) and Gabriel (recurring guest star Armie Hammer). Blair makes a secret deal with Nate's grandfather, William (recurring guest star James Naughton - "The Devil Wears Prada"), and Nate learns some disturbing information about his father's arrest. Meanwhile, Dan takes a job as a cater-waiter to earn money for college, but is distressed when he discovers the gig is a Passover Seder at the Waldorf penthouse, where several of his friends and family will be guests.