Ryan Phillippe gets cosy with Amanda Seyfried

London: American actor Ryan Phillippe is reportedly dating actress Amanda Seyfried.

The couple was spotted out together at actress Kate Hudson`s Halloween party in Los Angeles Saturday night and sources nearby claim the pair are "obviously" a couple.

"Ryan and Amanda were definitely together but they didn`t really want us photographers to see it," contactmusic.com quoted a paparazzo as saying.

"Before they realised we were around, they were laughing and chatting with other people at the party and were obviously a couple.

"Ryan was really sweet with her -- he had his hand on her lower back for a while when they were talking to another couple. They looked great together," the photographer added.