Katie Holmes has reportedly gone through a dramatic weight-loss regimen to "get herself in shape." But why the intense effort?

• Because she idolizes Nicole Richie?
• So she can resume her acting career?
• So she can fit her crazy ass into a wedding dress?

All of the above are solid theories... but with rumors of impending TomKat nuptials swirling, we have to believe the latter is most credible.

According to a report this weekend, her baby's daddy, Tom Cruise has been "eager" to get Katie to get fit, and that evidently she's done him proud.

"Katie has lost a lot of weight. A lot," an observer tells MSNBC. "I've heard that Tom was eager to get her back in shape. Looks like she made him happy. And then some."

The prevailing buzz, of course, is that the wedding of Suri Cruise's crazy parents is imminent, and Cruise's rep, Arnold Robinson, has maintained all along that the pair will be getting married sometime this fall.

If only they'd tell us when and where. They're making it awfully hard for T.H. Gossip to crash the thing! Jerks.