By Tim Stack
Updated April 22, 2009 at 02:09 PM EDT

Turns out the rumors are true: Heidi Montag and Spencer Pratt will indeed tie the knot this weekend in Pasadena, Calif., and their nuptials will be filmed for MTV’s The Hills. Producers have invited all of the cast for the blessed union and are hoping they will attend but still aren’t sure of the final guest list.