Golden Egg #7 is located on level 8 of Angry Birds Seasons Go Green, Get Lucky. Zoom out and you’ll see there is an arrow pointing up to a platform. There is a Golden Egg on this platform that you can get it by launching a Yellow at just the right angle.
To obtain the star on the level, fling a bird through the left and center piggies while the stack of hats are over the right pig. These dropping should cause the last pig to topple.