7. Joseph Gordon Levitt
How you know him: He has been in films such as Inception and Looper.
Why he should: He is young looking. He can sing. He is adorable. And, he is a family-friendly celebrity who has not done anything crazy.
Why he shouldn't: He may look a little too old. While you can dress down his age, it may not be enough. Also, he doesn't have true experience with musicals. He is a good singer but will that be enough to hold him through?
Watch him sing:
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