In the vernacular, the word "doppelgänger" has come to refer (as in German) to any double or look-alike of a person.
I have been told a few different times that I look like different celebrities each of which seems weird to me. Twice in college I was told that I look like Avril Lavigne and both times the person asked if I got that "all the time" like it was a compliment to look like a slutty singer.
Next was just a few weeks ago at Sam's wedding when some relative of the Jones or Gilespie family (I really don't know who it was) told me that he and his wife thought I looked exactly like Gweneth Paltrow
which seems like a better compliment but I still don't get it.
There was also a period of time in elementary school when Hanson was super popular that I was told MULTIPLE times that I looked like the super hunky youngest brother Zack... Not something I wanted to hear as a 10 year old girl that I looked like a boy... even though I was a huge tom-boy