Lovelace premiered today on demand (and in limited release in theatres and there are HD clips.
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One of Mr. Skin's scouts, saw Lovelace, and has reported the Amanda Seyfried has 7 nude scenes, She mostly shows breasts but there is a scene where she briefly moons a camera. You can read all of them at the below link, but here are some of the key ones.
(0:12) Amanda Seyfried comes out of the bathroom in just her panties with her breasts exposed. Her left breast is still exposed as she gets into bed and there is a great look at both breasts as Peter Sarsgaard kisses her belly scar.
(0:27) Amanda Seyfried swimming underwater in just her bikini bottoms gives us another look at her breasts.
(0:40) Amanda Seyfried several shots of her breasts during a photoshoot.
http://blog.mrskin.com/breaking-nudes-sundance-lovelace---14995