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Michelle Trachtenberg Heads To 'NCIS: LA' For Action-Packed Holiday Episode

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BEVERLY HILLS, CA - NOVEMBER 04: Actress Michelle Trachtenberg attends the premiere of National Geographic Channel's 'Killing Kennedy' at Saban Theatre on November 4, 2013 in Beverly Hills, California. (Photo by Imeh Akpanudosen/Getty Images) | Imeh Akpanudosen via Getty Images

Michelle Trachtenberg is visiting the gang at "NCIS: LA."

EW has learned that the "Gossip Girl" alum, who recently appeared in "Killing Kennedy," will guest star in an action-packed holiday episode set to air Dec. 17 on CBS.

Read the whole story at EW