Sasha Alexander (born May 17, 1973) is an American actress. She played the role of Gretchen Witter on Dawson's Creek. She also acted in feature films such as Yes Man (2008); and He's Just Not That Into You (2009). Alexander also acted as former Secret Service/NCIS Special Agent Kate Todd for the first two seasons of NCIS. Since July 2010, she has starred as Maura Isles on the TNT series Rizzoli & Isles.