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At least depending on how we end up defining a planet since there is no real definition of one yet. Right now an object larger than pluto has been found orbiting within the solar system further out that pluto.
http://www.space.com/scienceastronomy/060201_tenth_planet.html

We may end up with 8 true planets, and several hundred "dwarf planets" that make up the solar system. If this ends up being the case then I won't feel like something is missing next time I listen to Gustav Holst: The planets suite.