Imagine a question and stream-of-consciousness explanation for which this is the answer: Emma Stone
Question: The character has been portrayed by Bryce Dallas Howard in the 2007 film Spider-Man 3 and by Emma Stone in the 2012 reboot film The Amazing Spider-Man and its sequel The Amazing Spider-Man 2. In the upcoming 2018 film Spider-Man: Into the Spider-Verse, the character will be voiced by Hailee Steinfeld.

Who played gwen stacy in the amazing spider man?
Stream-of-consciousness: The relevant information to answer the above question is: The character has been portrayed by Bryce Dallas Howard in the 2007 film Spider-Man 3 and by Emma Stone in the 2012 reboot film The Amazing Spider-Man and its sequel The Amazing Spider-Man 2.