“GOSSIP GIRL” — (8:00-9:00 p.m. ET)

“Raiders of the Lost Art” (TV-14, LS) (HDTV)

ELIZABETH HURLEYANDDESMOND HARRINGTON GUESTSTAR— Chuck (Ed Westwick), Nate (Chace Crawford), Blair (Leighton Meester), Serena (Blake Lively) and Lola (guest star Ella Rae Peck) team up to uncover what they think is an explosive secret between Diana (Elizabeth Hurley) and Jack (guest star Desmond Harrington).  Meanwhile, Dan (Penn Badgley) is offered a prestigious fellowship inRomefor the summer.  Matthew Settle also stars. Bart Wenrichdirected the episode written by Jake Coburn (#522).