I think the fact that "Keira Knightley" posted on this thread about 20 minutes after it was started is enough proof that that's probably not her. I'm sure she'll stop by occasionally, but come on....an account? I think not. At least not with her own name.
My personal opinion is that Duckula is Keira, and he's been pulling the wool over our eyes for the last 4 years.
When you see him in person...well....look for a zipper.
Like Lucky Charms...Only Yummier!