Amanda Seyfried and Josh Hartnett have been dating for about two months, a source close to the Hollywood couple told UsMagazine.com. \"Josh likes to keep things low-key, so they\'ve just been hanging out,\" the insider said, adding the film stars were set up by a mutual friend. Seyfried previously dated actors Ryan Phillippe and Dominic Cooper. Hartnett\'s former flames include actresses Scarlett Johansson and Penelope Cruz, and singer Rihanna.