The "Gossip Girl" star was in Cannes on Saturday to celebrate a new movie, "Romeo and Juliet," at a champagne reception on the beach.
Filmed in Italy, the British actor sports shoulder-length hair as Tybalt, Juliet's cousin, in this movie production of William Shakespeare's romantic play.
The role of Romeo goes to another Brit, Douglas Booth, while Oscar-nominee Hailee Steinfeld plays the famous heroine.
Written by "Downton Abbey" creator Julian Fellowes, it's directed by Carlo Carlei.
Westwick told AP he studied the tragedy at school and they shot at the historic Juliet balcony in Verona - although they had a stunt balcony built too.
He starts filming the final series of "Gossip Girl" in July.