Posted on Thu Apr 28, 2011 08:35 AM PDT
Katy Perry is suing the Australian magazine that claimed she had an affair with her record producer, Benny Bianco.
NW said that Perry, 26, cheated on her hubby Russell Brand, 35, with the music man after she and Brand had married.
The singer filed the claim today in Melbourne, Austalia after landing there to perform for her world tour.
NW wrote the article last month, saying that Perry and Bianco had an "intimate relationship" and that her marriage was now in trouble.
See how much Katy could stand to win in court after the jump!
Katy could reportedly get a six-figure payout if she wins the lawsuit.
Many stars who win defamation lawsuits such as this one give their winnings to charity; most recently Katie Holmes.
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Katy Perry Leaves Miami For Brazil - Jul 29, 2012
Katy Perry Flaunts Her Bikini 'Bod In Miami Amid Rumors Of John Mayer Hookup - Jul 28, 2012
Katy Perry Rocks A Teeny String Bikini In Miami - Jul 27, 2012
Katy Perry And Russell Brand's Divorce Finalized - Jul 16, 2012