After spending some time with Russell before X-mas, Katy Perry headed back home to LA to get ready to move in with her rumored fiance.

Russell bought a Los Feliz mansion for 3.25 million for Katy earlier this month, and plans on turning it into a love nest for the couple in the new year.

The new place boasts 4 bedrooms and 4.5 baths...plenty big to start a family!

It also features rolling lawns, formal gardens and a pool and spa. (Check out the pix in the gallery below.)

Despite the fact that the couple didn't actually spend the holiday together (Katy returned on the 24th), sounds like they're getting ready to spend a lifetime together! Heck, if my boyfriend bought me this house, I'd never leave him!