Actor and Celebrity Rehab alum Gary Busey turns 65 today. Producer Robert Evans turns 79. Comedian Richard Lewis is turning 62. Wendy Kopp, the founder of Teach for America, is turning 42. Top Silicon Valley venture capitalist John Doerr is 57. Web entrepreneur Scott Heiferman is 37. Colin Hay of Men at Work is 56. Race car driver Jeff Burton turns 42. Philadelphia mayor Michael Nutter is turning 52. And "Pussycat Doll" Nicole Scherzinger celebrates her 31st birthday today.