By | May 23 2012 6:21 PM

Robert Pattinson's latest film -- Cosmopolis -- doesn't premiere at the Cannes Film Festival until Friday, but the actor headed to the seaside festival early to support his girlfriend Kristen Stewart -- whose film On the Road premiered Wednesday. It marks a rare non-Twilight related public appearance for the famously private couple, who have never publicly acknowledged their romance and habitually dodge questions on the subject.