Hollywood beauty SCARLETT JOHANNSON has given U.S. troops in Iraq something to smile about - she'll be performing there this autumn (07). The Lost In Translation star releases her debut album later this year, and admits she's so nervous about her first gig abroad she isn't even sure she'll be able to sing. Johannson jokes, "I'll probably just take the stage, hang around and ooze sex appeal." But the actress admits she's thrilled her fame allows her to make a difference to people's lives. She adds, "I'm so lucky that I have an opportunity to make some sort of difference."