Even fameballs fall to the earth eventually: Get ready to say a well-deserved farewell to faux celebs Spencer and Heidi Pratt.

The final season of MTV’s “The Hills” debuts tonight at 10 on MTV (followed by the season premiere of “The City” at 10:30 if you care, and you know you don’t).

The alleged docudrama (some parts were scripted, MTV conceded) followed 20-somethings Lauren Conrad (who left a year ago), Spencer and Heidi, among others.

As they did little more than mope and bicker on camera. The heavily, sometimes hysterically edited pauses amped up drama where there was none.

Somehow, the show became a hit with viewers, drawing at its height about 3.5 million viewers.In the final 12 episodes, look for Heidi’s surgically enhanced physique to draw the anger of her mother. Maybe Mom should cut her brainiac child some slack. Heidi probably figured it was about time she physically embodied the show’s title.