Fashion star Zac Posen celebrates his 28th birthday today. Actor Kevin Kline is 61. Law & Order's B.D. Wong is 48. R&B singer Monica is turning 28. Shenae Grimes of 90210 is 19. Your favorite bisexual MTV personality, Tila Tequila, is 27. And Russian billionaire Roman Abramovich celebrates his 42nd birthday today. Weekend birthdays after the jump.

Looking past the fail that is Vista, Microsoft is working on a next-generation operating system codenamed "Midori." Eric Rudder, a senior vice president at Microsoft whose name has been floated as Microsoft's next CEO, will be developing the new OS. Shockingly from a company known for slogging away at version after version of its existing software, Midori won't even be based on Windows. Programming for Midori will also be different, designed for many kinds of devices, from cell phones to server farms.

A former child prodigy, Midori is a celebrated classical violinist from Japan who now makes her home in New York.