Nobody's doing Christmas spirit quite like the Obamas. This year, America's first family has taken their celebrations up a notch, teaming up with celebrities, kids, and adorable elves for one seriously festive holiday season before heading over to Hawaii to finish the year under the sun. The Obamas' Christmas fun kicked off with the arrival of their giant Christmas tree, which just so happened to come in on a horse-drawn carriage. And what could be more festive than singing with Miss Christmas Songs herself, Mariah Carey? Because yes, the Obamas did that, too. As the holiday approaches, take a look at all the reasons why President Obama and his girls are having the best Christmas ever.