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The Society of Memorial Sloan-Kettering Cancer Center hosted its second annual Spring Ball at the Plaza on Tuesday night. More than 350 people turned out for the NBC Universal-sponsored event, including NBC Universal president Jeff Zucker and his wife Caryn (left), Mort Zuckerman, Robert De Niro and Grace Hightower, Julia and David Koch, Tory Burch and Lyor Cohen, Hilary Geary and Wilbur Ross, Jonathan and Somers White Farkas, Shoshanna Lonstein Gruss, Peter and Jamee Gregory, Ginny and Tiki Barber, Sherman and Chris Meloni, Frank and Kathie Lee Gifford, Hoda Kotb, Peggy Siegal, Natalie Morales, Valesca Guerrand Hermes, Jennifer Creel, Renee Rockefeller, Alexandra Lebenthal and Jay Diamond, Danielle Ganek, Kimberly Kravis, Muffie Potter Aston, Hilary Gumbel, Dr. Harold Varmus, Dennis Basso, Heather Mnuchin, Anne Grauso, Sylvester and Gillian Miniter, Gigi Mortimer, Sara Ayres, Shafi Roepers, Leslie Jones, and LL Cool J. [PMc, Wireimage, NYSD]

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• The New York City Ballet held its 2009 spring gala inside the David H. Koch theater at Lincoln Center last night. Attendees included Ed Norton, Sean Avery, Maria Bartiromo, Lisa and Phil Falcone, Candace Bushnell and Charles Askegaard, Lesley Stahl, Arie and Coco Kopelman, Alexandra Kerry, Nina Griscom, Allison Sarofim, Hope Atherton, Magnus Berger, Hamish Bowles, Anh Duong, Al Roker, Alexandra Lebenthal, Vanessa Williams, Elise Overland, Liz Lange, Franci Blassberg, David Monn, Peter Martins, Charlotte Moss, Dr. Susan Krysiewicz, Fiona Scarry, and Samantha Ronson, who handled the music. [PMc, FWD]

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• An A-list crowd gathered at the United Nations on Tuesday night for "Welcome to Gulu," an exhibition and benefit featuring art work by the victims of human trafficking victims in Uganda. Guests at the event included Ross Bleckner (who curated the exhibit), Alec Baldwin, Nic Cage, Donna Karan, Calvin Klein and daughter Marci Klein, Francisco Costa, Eli Broad, Ingrid Sischy, Stefano Tonchi, Amy Fine Collins, Amy Astley, Deborah Roberts, Agnes Gund, Georgette Mosbacher, Anne Hearst, Debbie Bancroft, Cece Cord, Rachel Roy, Andrew Saffir and Daniel Benedict, Katie Ford, Richard Johnson and Sessa von Richthofen, Patrick McMullan, Joy Behar, Famke Janssen, Marisa Berenson, Jane Holzer, Mary Boone, and UN Secretary General Ban Ki-Moon, [PMc, Wireimage, VF]