The inevitable split rumours surfaced when the pair put their current home on the market last month, but now all is clear - they were just upgrading...
Their new Hollywood Hills property boasts a swimming pool, guest house and mini cinema, as well as nine bathrooms and seven bedrooms - on nearly three acres of land.
According to RadarOnline, the sprawling mansion was previously home to Daniel Lakin, former CEO of National Lampoon - who was sentenced to 45 months in prison for stock manipulation charges last year. (Oops. Hope that's not a bad omen.)
The pad was also reportedly used for filming a series of US show The Bachelor.
Click on our gallery below to take a tour of Katy and Russell's new pad: