The former couple's Hollywood Hills mansion which they resided in during their short-lived marriage has gone on the market for $6.925 million, according to RadarOnline.com.
The British comedian and the 'Teenage Dream' hitmaker hardly ever lived in the three-acre property - which they originally bought for $6.5 million - as Katy embarked on her nine-month 'California Dreams' world tour shortly after they wed at a tiger sanctuary in India in October 2010.
The two-story, 8,835-square-foot house boasts s even bedrooms and a whopping 11 bathrooms, with the outside area featuring two guest homes and a pool with a waterfall.
Katy and Russell officially lived in the house until the 'Forgetting Sarah Marshall' star filed for divorce in December 2011.
The pop star has since dated musician and notorious womaniser John Mayer, but they split in March and Katy is rumoured to have been messaging Russell for support. It has also been alleged her eight-month romance broke down because she was constantly comparing John to her ex.
A source said: ''Katy reached out to him after she split with John, bemoaning her luck with men and Russell provided her with some much-needed reassurance.''