Before premiering their latest collaboration “Blue Moon” at Berlin Film Festival, Richard Linklater and Ethan Hawke revealed that they have a 10th film together in the works. "Blue Moon" marks Hawke and Linklater's first film together in over a decade,

Berlin: Ethan Hawke and Richard Linklater on their new film 'Blue Moon,' in which Hawke plays American lyricist Lorenz Hart.

Hawke was joined by co-stars Margaret Qualley, Andrew Scott and director Richard Linklater for a press conference on their new film, 'Blue Moon', premiering at the Berlinale Tuesday.