Auto populate currently logged in user's user id in forms

Hi.
Here what I have done http://github.com/gvkalra/showtime/blob/master/photo/views.py

What I want to do is:
Auto populate the database with currently logged in user's user id
like it has been done with the date of creation of the record by
using
uploaded = models.DateField(auto_now_add=True)

how to do that with:
clicked_by = models.ForeignKey(User) ??

something like
clicked_by = models.ForeignKey(User.username, editable=False)

{though it doesn't work, but just to demonstrate the idea} ........

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