Oprah Winfrey, Paris Hilton, Ben Stiller, Brad Pitt and Angelina Jolie are among the celebrities and artists urging support for survivors of the earthquake in Haiti. Doctors Without Borders announced Wednesday that Pitt and Jolie were contributing $1 million to the organization's emergency medical operations responding to the earthquake. The organization said it is dispatching additional emergency staff, including a surgical team and equipment to establish a 100-bed inflatable tent hospital with two operating rooms. “We understand the first response is critical to serve the immediate needs of countless people who are now displaced from their homes, are suffering trauma, and most require urgent care,” Pitt said in a statement. Stiller tweeted late Tuesday that “people in Haiti need our help and attention right now.” Similar tweets are showing up from the likes of Hilton, Lindsay Lohan, Adam Lambert and Ryan Leslie. Singer Wyclef Jean arrived in Haiti, his native country Wednesday. “I cannot stress enough what a human disaster this is, and idle hands will only make this tragedy worse,” he said in a statement. “The over 2 million people in Port-au-Prince tonight face catastrophe alone. We must act now.” Publicist Leslie Chasky said he is focusing on his family, his Haitian charity, Yele, and responding to the disaster. Shakira, on her Web site, called for donations to Yele and to UNICEF. Winfrey began her television talk show Wednesday by asking viewers to donate to the Red Cross. “This is a time where we, as a global nation, should come together and support those who are in need,” Winfrey said. Coldplay singer Chris Martin urged people to donate to a Haiti appeal set up by the charity Oxfam. “I visited Haiti with Oxfam a few years ago. It's a country of extreme poverty and brutal living conditions,” Martin said. “Most people in Port-au-Prince live in tin shacks. The earthquake that has struck Haiti will have turned the city into an unimaginable hell.”