Tim Gunn of Project Runway (and chief creative officer at Liz Claiborne!) turns 55 today. Also celebrating: Designer Cynthia Rowley is turning 50. Anne Hearst—heiress, occasional writer, and bride of Jay McInerney—is 53. ABC News president David Westin is 56. Actor Stephen Dorf turns 35. Famed choreographer Paul Taylor is 78. Multimedia artist Jenny Holzer is 58. And IBM chairman and chief executive Sam Palmisano will celebrate his 57th today.