Makeup makes a world of difference sometimes, and it has a marvelous effect on accentuating the positive. Here are some celebrities who have been seen without their makeup on. The only question here is, can you guess who they are?

1. Guess who:

Who is this?

   Katy Perry

   Zooey Deschanel


2. Guess who:

Who is this?

   Tyra Banks

   Naomi Campbell


3. Guess who:

Who is this?

   Nicki Minaj

   Snooki


4. Guess who:

Who is this?

   Lady Gaga

   Madame Trelawney


5. Guess who:

Who is this?

   January Jones

   Julia Roberts


6. Guess who:

Who is this?

   Kylie Jenner

   Lucy Hale


7. Guess who:

Who is this?

   Hilary Duff

   Rachel McAdams


8. Guess who:

Who is this?

   Catherine Zeta Jones

   Sofia Vergara


9. Guess who:

Who is this?

   Kate Upton

   Silje Norendal


10. Guess who:

Who is this?

   Jennifer Lawrence

   Renee Zellweger


11. Guess who:

Who is this?

   Jennifer Aniston

   Christina Applegate


12. Guess who:

Who is this?

   Cindy Crawford

   Eva Mendes