Bird's Nest

This is a 2 photo HDR image of a bird's nest on my front porch.

I noticed that two of the eggs are white and one is brown. I am guessing a bird who did not make the nest laid an egg in there so the nest building bird would raise her young. Anybody know what kind of bird this could be?

 

Check out the mama bird here

 

Oh yeah by the way, happy easter!!!

Done