12 planets.

They didn't want to hurt the feelings of Pluto-lovers, so they picked a definition for planet that would include Pluto, and, doing that, they let in 3 more rocks. The nonconformingly named 2003 UB313 (AKA Xena). Charon, which is a moon, which is annoying. And Ceres, ceresly. Wouldn't it have been pleasanter to just oust Pluto? Come on, scientists! If you want to make us feel good, make us feel good!