In the comedy's April 30 episode, titled "Virgins," O'Brien will play Jess' prom date, who is a gorgeous and romantic guitar player, naturally. He promises to make her first time memorable for our adorkable heroine, who wants to lose her virginity to someone special.
"It's the story of how all of them lost their virginity," creator Liz Meriwether said of the flashback episode during New Girl's panel at the 2013 PaleyFest.
O'Brien plays the scene-stealing Stiles on MTV's hit series Teen Wolf, which returns for its third season on June 3.
TVGuide.com first reported the news of O'Brien's casting.
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