Susan Bennett is the best friend you've never met. The Georgia woman has revealed herself as the voice behind Apple's virtual assistant, Siri. The voiceover actress didn't know her voice was used to power the project until friends told her when the iPhone 4S came out two years ago. She had originally been hired for a project for ScanSoft, which was later acquired by Nuance, which powers Siri. Apple declined to comment on the mystery voice, but an audio forensics expert confirmed the match.