The chart-topping singer hits the stage for a good cause in Las Vegas. Plus: Usher, Katie Holmes, Lauren Conrad and more


Armed with a new No. 1 album (her crossover disc, Do You Know, hit the top of the country charts), Jessica Simpson takes the stage at The Palms' Pearl Theater in Las Vegas for a show benefiting the local Rape Crisis Center. "It's important to make a stand for women's rights," the singer said.