The girl
You recognize Kristen Hager who played the werewolf Nora Sergeant on the US version of Being Human. She spent a fair bit of time naked on that show, too, though mostly it involved waking up naked in the woods covered in dried blood and enjoying carnivore's morning mouth. But yeah, other than, she's a hottie.
In Expanse, she's playing a character named "Ade Nygaard".