A Mexican Government official called Marcelo Ebrard told his Twitter followers: "Confirmarles que Britney Spears estará el domingo 4 a las 1900 hrs en el Monumento a la Revolución en el inicio de navidad''. Which roughly translates to 'Brits is totally playing THIS Sunday guys!!'.
The performance will also be broadcast on national television, if people don't wanna go-oh-oh all the way. There will be two other dates in Mexico, but this is going to be the only free one.