Doe-eyed super-cuties (like the Russian kid on 2009 Star Trek)

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I have to say, I adore the Russian guy, (Chekov), on the new Star Trek. His actual name is Anton Viktorovich Yelchin. He plays such a doe-eyed, well-meaning, innocent crew member with the funny accent. And when he gets all excited and runs to the transport bay repeating, "I can do zat! I can zat!" So very cute! So I suppose my question is, do any other super cute supporting actors come to mind that you can't help but smile when you see them on screen?