Usually, it's the movies that generate the buzz at ShoWest, the annual Las Vegas gathering where theater owners get a sneak peek at the upcoming summer blockbusters. This year, however, the sho-stopper was the arrival of Brad Pitt and Angelina Jolie at a luncheon on the final day of the convention. They were there to introduce their new film, Mr. and Mrs. Smith, in which they play husband and wife assassins. And as if that wasn't exciting enough, that evening Jennifer was in the house to accept an award for female star of the year. Check out the trio's wild weekend in Vegas, as well as snapshots of many other stars...