Sasha Alexander is an American actress of Serbian descent. She is known for her roles as NCIS Special Agent Caitlin "Kate" Todd in the first two seasons of the CBS television drama "NCIS", a minor role as Melissa in "Mission: Impossible III (2006)", and as Catherine in "He's Just Not That Into You (2009)". She also had a guest appearance in the episode "The Down Low" of the TV-series "House".
