52588, LOS ANGELES, CALIFORNIA - Friday March18 2011. Bradley Cooper, who has reportedly split from Rene Zellweger, arrives in to LAX alone. "The Hangover" star kept his head low as he walked through the airport. Cooper met Zellweger in 2006 on the set of "Case 39" but they didn't start dating until 2009. Photograph: © David Tonnessen, PacificCoastNews.com **FEE MUST BE AGREED PRIOR TO USAGE** **E-TABLET/IPAD & MOBILE PHONE APP PUBLISHING REQUIRES ADDITIONAL FEES** UK OFFICE:+44 131 557 7760/7761 US OFFICE:1 310 261 9676