"Fast and Furious 6," "The Hangover Part III," "Iron Man 3" and "Star Trek Into Darkness" are all competing at the box office this long holiday weekend -- but one very important question remains.

Which film has the hottest stars?

From the bulging biceps of The Rock and Vin Diesel to gorgeous sci-fi sirens Zoe Saldana and Alice Eve, we've pitted costars and their box office competition against each other in a battle of looks.

Check out the gallery above to vote in categories like "Hottest Bald Badass" and "Sexiest Superhero" and let us know who really has your heart racing in theaters this summer! 

Which movie are you looking forward to seeing most? Sound off below!

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