Not so sure about Yahoo's claim of "astonishing accuracy" but if this whole actress thing doesn't work out, she could probably make a few bucks on ebay...

From Yahoo:

Thursday on "Jimmy Kimmel Live," actress Emma Stone let us in on a secret talent she's had since she was 10 years old. Stone says she was a huge fan of the Spice Girls, and memorized all of their autographs that were copied on their merchandise. Kimmel decided to test her skills, and she did not disappoint. With astonishing accuracy, Stone signed Sporty, Baby, Scary, Ginger and Posh's autographs with little hesitation.

https://tv.yahoo.com/nighttime/emma-stones-fanatical-hidden-talent-...