was David Letterman
's guest on "Late Show
" (Weeknights, 11:35 p.m. ET on CBS) Thursday night. The "Gossip Girl
" star was there to promote her new movie, "Savages
," and she hinted that working with Oscar-winning director Oliver Stone
hadn't been the most enjoyable experience in the world.When the movie wrapped, she wanted to buy the crew a gift, "because they needed something nice after working with him for that long," she ...