It appears as if Spencer Pratt is in rare form on The Hills tonight.

Upon learning that Holly Montag - having been exiled from Speidi's pad - moved in with Lauren Conrad, Spencer derides her to Heidi, insinuating that their "stalker" mom orchestrated the whole thing and that Lauren deserves to be stuck with the world's biggest mooch ... who's even worse than Stephanie.

Wow. Here's the preview of tonight's The Hills ...

Speidi Spars