K-Fat will Become K-Fit — on Reality Show  —  Looks like Kevin Federline is tired of all the K-Overfed jokes — because TMZ has learned he officially signed on to do the next season of “Celebrity Fit Club.”  —  Federleezy has packed on the pounds of late — see Exhibit XXL above — but he's on a mission to reduce the rolls.

Mackenzie Phillips: I Slept with My Own Father  —  “Don't hate my father,” Mackenzie Phillips tells PEOPLE.  —  But in a tell-all book out Wednesday, the former childhood actress reveals that her dad, musician John Phillips of the '60s band the Mamas and the Papas, engaged with her in a long-term incestuous relationship.

Sarah Michelle Prinze and Freddie Prinze Jr. Have a Girl!  —  Sarah Michelle Prinze and husband Freddie Prinze Jr. are parents, PEOPLE has learned exclusively.  —  The couple “welcomed their daughter Charlotte Grace Prinze on Saturday, Sept. 19,” says a rep for the actress.  “The family is over the moon.”

Jaclyn Smith Alive and Well!  —  Honduran media reported earlier that Jaclyn Smith was rushed to the hospital, the victim of an apparent suicide attempt.  El Heraldo, a local newspaper, which first broke the news, is now reporting that it was NOT Jaclyn Smith who was taken to the hospital …

Khloe Kardashian Chooses Her Wedding Registry  —  Khloe Kardashian and mother Kris Jenner  —  With little time to spare before her Sunday nuptials, Khloe Kardashian and her mother Kris Jenner headed to Williams-Sonoma in Beverly Hills on Monday afternoon to pick out her wedding registry.

A New Man for Kate Walsh  —  Kate Walsh seems to have moved on from her divorce to film executive Alex Young - she attended the Emmy Awards Sunday with new beau Neil Andrea.  But the Private Practice actress isn't about to kiss-and-tell.  —  When asked about her hot date, Walsh told PEOPLE, “I'm not going to talk about that!

Twilight's Meyer Tackles Adult Pic Fare With Niccol  —  Producers Nick Wechsler, Steve and Paula Mae Schwartz have used their own money to acquire screen rights to “The Host,” the first adult novel written by Stephenie Meyer, author of the “Twilight” series.  —  Andrew Niccol will write the script and direct.

Diablo Cody adapting ‘Sweet Valley High’  —  “Sweet Valley High” filtered through Diablo Cody?  —  That is exactly what Universal is doubling down on, in negotiations to pick up the rights to the long-running book series, with Cody attached to adapt.  Cody also will produce with Mason Novick as well as Marc Platt.

Travolta First Witness — Smoking Gun to Follow  —  We've learned John Travolta will be the first witness called today in the extortion trial over his son's death — and after John steps down from the stand, there will be a legal dogfight in the courtroom over what could be the smoking gun in the case.

The Rumors Are True!!!  —  Hi dolls.  I'm thrilled to finally be able to tell you that the news is true... Lamar and I are getting married on Sunday!!!  I couldn't be happier and I'm so excited that I can finally share the news with all of you.  —  Your well wishes have meant the world …

Fincher Makes Facebook Connections  —  Columbia Pictures and director David Fincher have set its core cast for “The Social Network,” the Aaron Sorkin-scripted drama about the formation of Facebook.  —  Jesse Eisenberg will play founder Mark Zuckerberg, Justin Timberlake will play Sean Parker …

Scenes From an Italian Opera Opening: Joel, LeeLee, Others Take in ‘Tosca’ at the Met  —  “We lost Meryl Streep,” a PR girl told The Observer when we arrived to the opening night of the Metropolitan Opera on Monday, Sept. 21, for a staging of Tosca, which Ms. Streep was expected to attend, but, alas, did not.

Jennifer Garner's an Old-Fashioned Mom  —  Jennifer Garner may downplay her mom abilities, but she has no shortage of ideas about encouraging her kids to think creatively, a friend says.  —  “Every day, you feel like you are off-balance one way or another,” Garner, at Monday's Hollywood premiere …

Charlie Sheen's wife Brooke Mueller upset at Emmy suite at better gift for Sheen ex Denise Richards  —  Brooke Mueller may be Charlie Sheen's second wife, but that doesn't mean she has to accept second best.  —  Mrs. Sheen 2. threw a fit at Kari Feinstein's Emmy Awards gifting suite …

Honeymoon's Not Over for Bruce and Emma Willis  —  They're just another married couple now, but you wouldn't have guessed it from the way Bruce Willis and new wife Emma Heming were acting in New York Monday night.  —  At the Cipriani Wall Street for Susan and Tony Bennett's Exploring the Arts Gala …

Lamar's Baby Mama on Khloé Nuptials: “I Thought It Was a Joke”  —  If you think you're surprised by Khloé Kardashian and Lamar Odom's upcoming quickie wedding on Sunday, imagine how the groom's ex-fiancée must feel.  —  Odom, 29, began dating Liza Morales when they were both just 17 …

She totally hates them  —  JailBait Miley Cyrus was photographed by the paps after lunch with her friend yesterday.  Doesn't she look like she hates the paps so much?  They are vile, reprehensible creatures!  —  This, you see, is the message she tried to convey on her Twitter yesterday:

GO BEHIND THE SCENES OF MY PREG PHOTO SHOOT WITH J SQUARED!!!  —  Hi everyone!!!  The other day i did a photo shoot with my faaaavorite photographers... J Squared.  I go to them for everything They're so talented and i always love the way the pics turn out.

Mel Gibson's Girlfriend: We Have No Plans to Wed  —  Oksana Grigorieva and Mel Gibson  —  Mel Gibson's girlfriend Oksana Grigorieva might be a mom-to-be, but she's not a bride-to-be.  —  Grigorieva, 39, dismissed marriage talk on British TV early Tuesday.