Us Weekly claims the two have been seeing each other since January.
Did Amanda Seyfried pull a fast one on us?
The 26-year-old actress is usually straightforward with the press about her love life. Just this month, she told Glamour about her friendly relationship with her ex-boyfriend, Dominic Cooper, and how they joke about having kids. She also told the magazine that she was single, but apparently that was stretching the truth! Amanda Seyfried On On-Screen Nudity & Being Friends With Her Ex
You may remember Hartnett, 33, from his memorable roles in Black Hawk Down, Pearl Harbor and 40 Days And 40 Nights. He's been MIA in the Hollywood scene for the past few years, but it seems he's getting back in the game later this year with his new film, Singularity.
So, how did these two stars hook up? They were apparently set up by a mutual friend, says Us Weekly's source. They were spotted out together on a double date with Michael C. Hall and Jennifer Carpenter in early February at the Chateau Marmont, according to NY Daily News. Jennifer Carpenter: I'm Still In Love With My Ex, Michael C. Hall
Us Weekly's source says, "Josh likes to keep things low-key, so they've just been hanging out."
Hmm, we wonder if Josh realizes what he's getting himself into. Seyfried also told Glamour that the next guy she dates may have to be "the one."
"I think about kids all the time. I feel like the next person I commit to, that's going to be the guy who I'm going to have kids with. That's in my crazy female brain. So that's why I'm like, 'I can't commit.'"
These two better take this one slow, unless Joshy has baby fever too!
Tell us: what do you think about Amanda and Josh as a couple?
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Photo Credit: Craig Barrit/GettyImages/Wireimage/NYDailyNews.com