idk about the hottest ever... and I know in the title it's about actors... but I've really been crushin' on Katie McGrath since I saw her pop up as Lena Luthor on Supergirl:
Then I saw she was in Frontier on Netflix with Ronin (Stargate Atlantis-- not gay, dude was just one of the better characters on that one... McKay OWNED that shit, though)/Khal Drago from GoT
Blast from the past (annoyed this phrase was ruined by one of the worst movies ever made) - YES. RR in his prime was the most fuckable person the world.