The songwriter and producer is currently collaborating with Cyrus on her fourth studio album, which he says will sound unlike anything the pop singer has done before.
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Pharrell Williams
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Miley Cyrus at the VH1 Divas 2012
He told MTV: "Her sound right now is her personality... That's what we've been aiming for in the studio."
The 39-year-old added that the music that Cyrus has produced so far has been "sounding interesting".
Cyrus, whose last album Can't Be Tamed debuted in 2010, was recently quoted saying that she is "making the kind of record [she wants] to make".
There is no word yet on when Cyrus's new album is expected for release.
Watch the video for Miley Cyrus's 2009 single 'Party in the USA' below:
