Hayden Christensen and Rachel Bilson left LAX together yesterday, going incognito in shades and hats. The on-again, off-again couple reportedly called it quits last month but appeared to be going strong as they shared some sweet glances on their way through security. Hayden and Rachel first began dating in 2007 and became engaged a year later, but they've weathered several breakups and makeups since then. The pair were at the airport likely heading to NYC for the Tribeca Film Festival, where Rachel's Karl Lagerfeld-directed Magnum ice cream ad will make its debut. She'll be one of several starlets taking part in the annual event. Anna Kendrick is one of 2011's judges, and other actresses like Christina Hendricks and Malin Akerman will also be on hand for this year's festivities.