Model Maggie Rizer is turning 31 today. Dave Matthews is turning 42. Times book critic Michiko Kakutani is 54. Hot 97 host Angie Martinez is 37. Internet tycoon Lockhart Steele is 35. Indie film honcho Michael Barker is turning 55. Earl Graves, the founder of Black Enterprise, is turning 74. Author Judith Krantz is 81. Singer Joan Baez is 68. And Kate Middleton, who stands to become a princess if Prince William ever pops the question, turns 27 today. Weekend birthdays—including that of Jared Kushner—after the jump!