Gavin Rossdale -- Post Divorce Home is Total Pimp Palace!!

The single life agrees with Gavin Rossdale -- in the real estate department, anyway -- because he just nailed down the sickest bachelor pad in Bel-Air.

Hard to get over a cool chick like Gwen Stefani, but a nearly 4,000 sq. ft spread sure helps! Our sources tell us Gavin moved in to this 5 bedroom, 5 bath spread just over a month ago.

We're told Gavin dug the place because it's not far from the Bev Hills home where Gwen and their kids live. He's only renting, but it has airliner views of L.A., separate guest house ... and an incredibly massive pool worthy of a Four Seasons resort.

Again. Divorce sucks, but ...