Jack Black turns 40 today. Jason Priestley of Beverly Hills 90210 fame is 40. Actor Ben Gazzara is turning 79. Country singers Shania Twain and LeAnn Rimes are 44 and 27, respectively. Olympic figure skater (and Celebrity Apprentice contestant) Scott Hamilton is 51. Actress Jennifer Coolidge is turning 46. Filmmaker Robert Greenwald is 64. And one of the Osmonds (Wayne) is turning 58. Some of the people celebrating birthdays this weekend—including Warren Buffet, Lisa Ling, and John McCain—are below.

Two people who are both a little too told to be doing what they're doing are celebrating birthdays today. John McCain turns 72 today and Michael Jackson is 50. Also celebrating today: Bob Rubin is 70, hedge fund manager Eric Mindich is 41, Hollywood director Joel Schumacher is 69, choreographer Mark Morris is 52, and Robin Leach is 67. Christine Schwarzman, gala staple and wife of Steve Schwarzman, is 56. On Saturday, Warren Buffett will celebrate his 78th, Lewis Black will turn 60, Andy Roddick will be 26, and Cameron Diaz will turn 36. On Sunday: Richard Gere will be 59, Patrick McMullan turns 53, Chris Tucker will be 36, SonyBMG CEO Rolf Schmidt-Holtz will turn 60, and Giants head coach Tom Coughlin will celebrate his 62nd birthday.

Choreographer Mark Morris is known for his irreverent dance compositions that challenge conventions and flip traditional gender roles, as well as for his volatile temper and colorful soundbites.