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The singer said that she and Timberlake spoke openly about past relationships and became "intimate" friends while working on her 11th studio album.
She told Interview magazine: "I really enjoy writing with Justin, he's a fun person to write with.
"We kind of had psychoanalytic sessions whenever we wrote songs. We'd start talking about relationships with people.
"That was the only way because, you know, writing together with somebody is intimate.
"I haven't worked with a lot of songwriters where I'm instantly connected and started riffing and playing with the rhythm of words. He's as interested in the rhythm of words as the meaning of words."
Her new album Hard Candy is released on April 28. It also feature collaborations with Kanye West and Timbaland.
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