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Amanda Seyfried and Justin Long Are Dating

Dave M. Benett/WireImage(LOS ANGELES) -- Amanda Seyfried is dating someone new, and it's actor Justin Long.

A source told Us Weekly that "Justin is super private about his relationships, [so] I'm not positive how they exactly met, but they've known each other for awhile when they were seeing other people."

In fact, the pair was spotted together at the July 30 premiere of Lovelace, the film centered on Linda Lovelace, a 1970s porn star.  Seyfried plays Lovelace.

"Justin came alone and stayed close to Amanda all night," the source told the magazine.  "They weren't making out or anything like that, but they were just inseparable during the event.  He hung out when she talked with others."

Seyfried has previously dated Dexter's Desmond Harrington and British actor Dominic Cooper.  Long has been linked to Kate Mara and Drew Barrymore in the past.

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