Amanda Seyfried dating Justin Long?

Los Angeles: `Lovelace` star Amanda Seyfried is reportedly dating Justin Long.

The pair, that was inseparable at the premiere of Seyfried`s film ‘Lovelace’ recently, have hooked up, reported Us magazine.

"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," a source said.

"They recently started hanging out more, going on date-like activities. They`re both busy, but they`re seeing where it goes," the source added.

Seyfried has previously dated Ryan Phillippe, Dominic Cooper, Josh Hartnett and `Dexter` actor Desmond Harrington. Long has previously dated Drew Barrymore.