For those of you who missed it, here's Britney Spears' unannounced visit to David Letterman's show last night, in which she finally and officially broke the news that she's pregnant—or, as she put it, "Don't worry, David, it's not yours." Dave then handed her a card with the evening's top ten list on it, and, after a tense moment in which the audience suddenly pictured Britney exploding into tears and admitting her illiteracy to an utterly unfazed America, she demonstrated not only her ability to read words (except "Tamiflu"), but her legendary comic timing. (For more Spears reading fun, watch her eyeballs slide back and forth like a typewriter wheel at a promotional appearance for her new perfume.) But no sooner than it seems as if Spears has finally lined up all of her ducks in a row of teetering high chairs, comes a new rumor that she may ambush Kevin Federline with divorce papers:

[S]he's met with her family and lawyer — but not hubby Kevin Federline — and the topic of divorce came up.

"Brit's been very unhappy, and I think she needs to find some peace," a source told Life & Style Weekly. "Once the Spears family gets its game plan together, the idea is to spring a divorce on Kev without warning."

The element of surprise could play a crucial, strategic factor in the Spears-Federline divorce. Deprived of a decent window of time in which to assemble a powerful team of volunteer attorneys from the local legal aid office, Federline will be forced to act as his own counsel in the proceedings. His chances at joint custody could be thrown into serious jeopardy when he responds to the judge's queries about how he plans on supporting his children by producing a boombox, turning "PopoZao" up to 10, and shouting over its Brazilian percussion about his plans to "open a Capoeira studio in the Valley some day."