 Portrayed by Kristin Kreuk , Lana Lang is one of Clark Kent 's friends and on @-@ again @-@ off @-@ again girlfriend . In the first season , Lana and Clark 's friendship is just beginning , as she is dating Whitney Fordman during this time . After Whitney leaves for the Marines in the season one finale , Lana and Clark slowly begin to try to start a romantic relationship . In season seven , Lana leaves Smallville , leaving behind a DVD explaining to Clark that , even though she loves him , the only way for him to help the world to the best of his ability would be if she left him and Smallville for good . 
