Is Gustav Holst rolling in his grave yet?

I think I missed the memo, but according to a CNN article, we now have 11 planets in our solar system instead of 9. When did we add 2 more???

The article in question cites the new planets Ceres and Eris, which are classified as drawf planets much like Pluto. Ceres is located between Mars and Jupiter, and Eris is now the furthest planet from the sun, surpassing Pluto for that honor.