The 26-year-old singer made the joke in reference to his Met Gala look!
Following the annual event on Monday, Nick took to Instagram to post a side-by-side pic of himself and Littlefinger (Aidan Gillen), a Game of Thrones character. While the resemblance is pretty uncanny in the photo -- with both men sporting rings and posing with their hands entwined in front of their stomachs -- Nick opted for a full white suit, silver bedazzled shoes and a stylish ear cuff and Littlefinger wore a completely dark look.
As fans of the HBO series know, Littlefinger was a master manipulator on the show, prior to his death at the hands of Sansa and her sister, Arya (Maisie Williams), last season.
"Sansa... We must protect the vale. #metgala #littlefinger," Nick captioned the pic.
Sophie was none too pleased with her new brother's jokes, quipping in the comments section, "Quit trying to manipulate me....... ugh I thought you died last season."
After deciding to channel Littlefinger on the Met Gala carpet, Nick had an even better idea for how he could've represented this year's theme, "Camp: Notes on Fashion."
"Honestly should have worn a Camp Rock inspired outfit tonight given the theme was 'camp,'" he quipped of his 2008 Disney Channel movie. "That would have been super tight. #MetBall2019"