Christina Aguilera is the the cover girl for the February issue of Marie ClaireMagazine, which hits newsstands Tuesday, January 17th. Christina opens up about her rough year, her body, being a single mother and even Kelly Osbourne calling her fat. Check out some highlights below: On 2011: "That was a rough year. Between my divorce and the other things I went through, a lot happened. It's hard for anyone to go through that ...