Angelina Jolie and Brad Pitt were together in LA last night to celebrate the release of NYT columnist Nicholas Kristof's new book Half the Sky. Nicholas is no stranger to a celebrity endorsement, especially after his work alongside George Clooney. It was a rare evening out for Brad and Angelina, who have been battling their latest rumors of trouble as she gears up for a new role and he tools around on his motorcycle. Brad and Angelina managed to keep a low profile at the event, as they mingled with other activists like Marisa Tomei.