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-The ex-RBD Christopher Uckermann already started his solo career, soon after launching his song "The World Ligh Up Tonight" in the U.S. Don Francisco, the Mexican prepare their duet with the singer Britney Spears.Britney who is doing the Circus Tour will record a song with Ucker soon, which will be part of the music CD of solo singer.Ucker is following in the footsteps of Dulce Maria, who has recorded a clip of Akon, and yesterday was presented with the same event in Los 40, in Mexico City.