Anyone know what this plant is?

I moved into my house a little over a year ago, and this plant was growing when I bought the place. The previous owner had inherited it from the people she bought it from and didn't know what it was either. The flowers are huge... some more than 8 inches in diameter. See... show more I moved into my house a little over a year ago, and this plant was growing when I bought the place. The previous owner had inherited it from the people she bought it from and didn't know what it was either.

The flowers are huge... some more than 8 inches in diameter. See picture:

http://img505.imageshack.us/my.php?image...

Anyone know what it is?
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