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Westwick fronted the British indie rock band The Filthy Youth, composed of himself, Benjamin Lewis Allingham, Jimmy Wright, Mitch Cox and John Vooght. While he is now inactive in the band, largely because he wants to focus on his acting career and the other band members are still based in the UK, he has expressed an interest in forming another group in New York.
Westwick became the new face of K-Swiss, making him the second member of the Gossip Girl cast to endorse sportswear (Leighton Meester endorsed Reebok).
He has guest starred in the third season of Californication as a student who is fascinated with vampire literature.
Pressler, Jessica and Rovzar, Chris (21 April 2008). "The Genius of Gossip Girl". New York. {{cite web}}: Italic or bold markup not allowed in: |publisher= (help)CS1 maint: multiple names: authors list (link)