The 'California Gurls' singer and the English actor have purchased a 1920s pad in Hollywood, which previously belonged to Daniel Laikin, the former chief executive of 'NATIONAL LAMPOON', who bought the home for $4.5 million in 2004.
The house - which has nine bathrooms, seven bedrooms and sits on three acres of land - was used in one series of reality TV dating show 'The Bachelor', which was hosted by Chris Harrison.
Other features of the Hollywood mansion include an outdoor swimming pool and a guest house.
The couple - who married in a ceremony on a tiger reserve India in October 2010 - are upgrading abodes after selling their $3.395 million mansion in Los Feliz, California.
They lived in the 1922 Mediterranean-style house - which has a swimming pool, four bedrooms and a three-car garage - sporadically for two years.
Russell is currently filming musical 'Rock of Ages' and Katy is away on her 'California Dreams' world tour.