Nicole Richie has entered a treatment facility. But it's not because she's anorexic. She's just tired. Tired of not eating! Ho, ho. We are comic geniuses. Like Carrot Top and Gallagher and our uncle Schlomo all rolled into one.

Us Weekly took time out from capturing candid shots of Teri Hatcher taking out the trash to bring us this scoop:

Nicole Richie has entered into a "diagnostic treatment program" to determine why she hasn't been gaining weight.

"She's not being treated for an eating disorder," a Richie source tells Us Weekly. "They're trying to figure out why she's not gaining weight."

Another source tells Us that Richie may be suffering from a rare blood disease, and that tests may reveal a connection to her inability to gain weight.

In the meantime, shooting of The Simple Life 5, which was scheduled to start next week, will be delayed by at least one week.

Richie's rep, Nicole Perna tells E!, "It is important to Nicole that she achieves this goal in a healthy way as this is not a treatment for an eating disorder."

Luckily E! has a backup plan for The Simple Life should Nicole's treatment be extended. In lieu of spending all that money on scripts and location scouting and wardrobe, E! personnel will simply follow TMZ videographers around and air hour upon hour of Paris Hilton getting into her car outside of Hyde, averting her eyes from the cameras with the stealthy use of her Sidekick. And in a very special episode, cameras will capture an actual text message between Paris and Nicole that will read something like this:

Nicole: I'm almost ready to be released. I've gained four pounds and can now eat an entire Hot Pocket.

Paris: Ha ha. Fatass.

Get some treatment for that Nicole Richie disorder at MrSkin.com.