The tall chick's character's name is Brienne, but I forget her real name off-hand. It's Gwendoline or something like that. But you can find nudie pics of her online. Something about she wanted to force herself to become more comfortable with her own body (she's like 6'3") so she posed nude for some photographer dude. Not sure why she didn't allow herself to be shown nude in GoT, considering she'd already bared herself before.
Personally I think one of the hottest chicks on the show is Natalia Tena, who plays Osha (the wildling chick who's looking after Bran right now). She looks pretty dumpy on the show but in real life I think she's a damned good-lookin' woman.