Ashlee & Heidi & Spencer? Oh, NO!

Ashlee, who's lookin' super-pregnant, on her own? That's fine.



Ashlee with her hubby Pete Wentz? Eh, that's fine, too.



But Ashlee with Heidi Montag and Spencer Pratt? (See more of 'em in the gallery below!) Has Hell frozen over? What's going on here!

Turns out the group was at a studio together. Does this mean they were recording something? Is an Ashlee/Heidi music collaboration is in the works?

I shudder to think!