In the vernacular, the word "doppelgänger" has come to refer (as in German) to any double or look-alike of a person.
Doppelganger is a funny word and facebook is funny about getting all hyped up over certain trendy topics, so I'm just conforming and joining right in! (This time...but don't tell me to repost things about the people I love, and causes I should believe in, and stats about who will and who won't... cuz chances are, I won't.)
When I was little and used to sing in church, people would tell me that I reminded them of Shirley Temple, though I'm not nearly as cute. 
From her side ponytail to her awesome Caboodles, Deb from Napoleon Dynamite totally sums up my middle school and high school years. 
Jodie Foster: I've been told more than once that I look like her. Maybe if she'd gain some weight I'd see it. Darn her!
Helen Hunt: Yeah, don't I wish!
j/k = just kidding.
I would love to have her dress though.
