MI-5, the British spy series, is awesome. Everybody on it is totally hot, especially when they're performing admirably under pressure, or being really smart or brave or cruel.
The picture is of Ruth (her name in real life is Nicola Walker). You may look at her and say, "Wha? This does not seem like celebrity crush material." You are dead wrong because you do not know Ruth like I know Ruth. Everybody underestimates her, and then her brain leaps up and kicks their asses.
Also, I just learned from her imdb page that she is practically six feet tall. That's hot.
I also have raging crushes on David Oyelowo and Keeley Hawes and Rupert Penry-Jones, but Ruth has my heart.