I would say Wentworth Miller, but he keeps his hair too short to see his curls.

Keeping with the Jonas brother theme. I think Nick has such pretty curls and always wears his hair curly.

Do locks count as curly hair? Jason Castro.
I can probably think of tons more, but I really need to study for my exam tomorrow.

One last one. I wish my hair looked like his. Travis from Gym Class Heroes.