Sad, funny, violent, incredibly touching - few films manage to tick all the boxes and even fewer are about hitmen. Young Natalie Portman is terrific, I mean she was 12 during this movie. How amazing is that! Of course Gary Oldman and Jean Reno are fantastic as well.
On the face of it, a love story between a twelve year old girl and a hairy French hitman would raise a few eyebrows, but director Luc Besson handles it so beautifully, it seems like the most natural thing on earth. They are united in being totally alone in the world. 

Cool Soundtrack too!

Plot:

Mathilda, a twelve-year old New York girl, is living an undesirable life among her half-family. Her father stores drugs for two-faced cop Norman Stansfield. Only her little brother keeps Mathilda from breaking apart. One day, Stansfield and his team take cruel revenge on her father for stretching the drugs a little, thus killing the whole family. Only Mathilda, who was out shopping, survives by finding shelter in Léon’s apartment in the moment of highest need. Soon, she finds out about the strange neighbour’s unusual profession - killing - and desperately seeks his help in taking revenge for her little brother. Léon, who is completely unexperienced in fatherly tasks, and in friendships, does his best to keep Mathilda out of trouble - unsuccessfully. Now, the conflict between a killer, who slowly discovers his abilities to live, to feel, to love and a corrupt police officer, who does anything in his might to get rid of an eye witness…

Trailer:

http://www.youtube.com/watch?v=Dc1KzpMnuX0&feature=related