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Working with Will.I.Am is exhausting, says Nicole Scherzinger

London: Former Pussycat Dolls` singer Nicole Scherzinger says working with rapper will.I.Am on his upcoming album `Willpower` was exhausting.

The 34-year-old said the Black Eyed Peas member is always "always thinking and creating", reported The Daily Star.

"He`s like a crazy ball of energy that just bounces off the walls. He`s always thinking and creating," she said.

The `X Factor` judge also said that she has worked with will.I.Am on her own solo project.

"He executively produced pretty much everything I`ve done, up until now," Scherzinger said.