With two nights off between her show in Helsinki, Finland, and Sunday night’s concert in St. Petersburg, Russia, Britney Spears wasn’t sitting on her laurels. The pop superstar headed to a studio in Stockholm, Sweden, to work with one of her favorite producers, Max Martin.

Brit and Max’s connection go all the way back to her first hit, “…Baby One More Time,” which he wrote and co-produced. More recently, he co-wrote and produced her single “If U Seek Amy,” from her current hit album, Circus.

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