Amanda Seyfried and Justin Long Dating? by Amanda Denton at August 15, 2013 1:52 pm. Comments It appears as if Amanda Seyfried has a new man. Are she and Justin Long dating? Share Tweet Email Edit Delete Follow Amanda Seyfried? Facebook Disqus Star: Amanda Seyfried Tag: Justin Long Related Videos: Amanda Seyfried Videos Related Post: Amanda Seyfried and Justin Long: Dating? Uploaded by: Amanda Denton Uploaded: August 15, 2013 Duration: 74 seconds