She's a Serbian-American actress that has been making rounds on the red carpet recently.
Sasha Alexander at Vogue's 1 Year Anniversary Party of Phillip Lim's LA Store in Hollywood, July 15 2009:
At the screening of Home in Stella McCartney's store in West Hollywood, June 5th 2009:
At the LA Premiere of Yes Man, December 17th 2008:
At the Catherine Malandrino Store Opening, 20th October 2008:

thecelebritycity
Sasha Alexander at Vogue's 1 Year Anniversary Party of Phillip Lim's LA Store in Hollywood, July 15 2009:



At the screening of Home in Stella McCartney's store in West Hollywood, June 5th 2009:




At the LA Premiere of Yes Man, December 17th 2008:





At the Catherine Malandrino Store Opening, 20th October 2008:



thecelebritycity