Cover Story: Brad's Marriage Ultimatum  —  Superstar parents Brad Pitt and Angelina Jolie are the world's most glamorous couple — but one thing has been missing from their seemingly perfect lives: A marriage certificate.  —  Now a friend of the pair tells OK! that Brad, 45, has issued Angie …

BRIDGET'S CAMP BLASTS GISELE  —  BRIDGET Moynahan is furious with Gisele Bundchen after Bundchen boldly bragged to Vanity Fair about being mommy to Moynahan and Tom Brady's son, John.  —  But while Moynahan is taking the high road and keeping quiet, her friends are not.

Miley Cyrus: America's Most Famous Girl Grows Up  —  She's a multiplatinum hit machine.  Her franchise is worth nearly a billion dollars.  And, oh yeah, she just got her learner's permit.  You are now entering the crazy, chaotic and completely fun world of Miley Cyrus …

EXCLUSIVE: New Music from Heidi Montag  —  We sense a new season of The Hills must be on the horizon as MTV star Heidi Montag exclusively released her new single “Look How I'm Doing” to On-Air with Ryan Seacrest Wednesday morning.  Soon after, she released a second single “Your Love Found Me” to PerezHilton.com.

Girlfriend of jailed O.J. Simpson is pregnant - by another guy  —  Christie Prody in September, 2007.  Credit: Splash News  —  O.J. Simpson is in prison in Nevada serving a 33 year sentence for felony charges stemming from a September, 2007 armed robbery of a sports collectible dealer in Nevada.

John Mayer Debuts “Heartbreak” Song After Splitting With Jennifer Aniston  —  Weeks after splitting with Jennifer Aniston, John Mayer debuted a new tune, titled “Heartbreak Warfare,” on his recent five-day cruise, Us Weekly reports in its latest issue, out today.

Gatecrasher: Wife has had her Phil of Rodman  —  Dennis Rodman's wife, Michelle Moyer, is in hot water with her estranged hubby.  —  According to insiders, Michelle filmed a segment on Dr. Phil McGraw's talk show two weeks ago, dissing Dennis and pleading with him to stop drinking.

Star Jones Still Views Herself as 300-Lb.  Woman  —  Star Jones  —  She may have shed 160 pounds, but Star Jones's self image has yet to catch up with her new body.  —  “I'm still 300 lbs. in my head some days,” the lawyer and TV personality, 47, tells Oprah Winfrey on Wednesday's Oprah.

Inside Mariah Carey's Romantic 40th Birthday Dinner  —  Continuing their tradition of taking lavish vacations together, Nick Cannon whisked his wife of almost one year, Mariah Carey, away to Barbados via private jet Wednesday evening to celebrate her 40th.  —  On the day of her birthday …

Mega Buzz on Housewives, 24, Leverage, Lost and More!  —  Every week, senior editors Matt Webb Mitovich, Mickey O'Connor and Tim Molloy satisfy your need for TV scoop.  Please send all questions to mega_scoop@tvguide.com.  —  When will Kim Bauer be coming back to 24?

Kristen Stewart: Some people think they know her, but ...  SANTA MONICA, Calif. — It used to be easier to live a secret life growing up.  —  You could leave home, disappear from the radar, have different circles of friends, and spend that hidden time figuring out who you are.

Carrie's Wedding Dress Sold Out  —  If there is one dress that defines Carrie Bradshaw it has to be the Vivienne Westwood wedding dress from the Sex and the City film.  Even if she didn't actually get married to Big in it, the dress is just so Carrie.  —  We're not too surprised then to hear …

Destiny's Child Is Back!  —  Are you ready for more Kelly, Beyonce and Michelle???  —  Well, though they “called it quits” a few years ago, Destiny's Child is reuniting!  And, sources tell us, not by choice.  —  “They still have another album they owe their label, Columbia Records …

Hayden Panettiere's chest has technical difficulties  —  Here's Hayden Panettiere getting ready for her appearance on The Sunrise Morning Show in Sydney today, and obviously, she's missing a crucial component to the cleavage mic.  Surprisingly, these pics don't include a shot of her getting taped …

Part Two: Angie Harmon Defends Bristol Palin's Pregnancy, Says GOP Is More Understanding  —  Part Two: Angie Harmon Defends Bristol Palin's Pregnancy, Says Republicans Are Much More Understanding  —  On Monday, Pop Tarts reported Angie Harmon's frustration at being considered “racist” …

David Cook Cancels Shows Due to ‘Family Matters’  —  American Idol champ David Cook hopes to return to his tour later this week after canceling two shows “to deal with personal family matters.”  —  The singer did not elaborate in the announcement posted on his Web site.

Taye Diggs and Idina Menzel Are Expecting  —  Taye Diggs and Idina Menzel in February  —  Talk about some powerhouse pipes.  —  Broadway belters Taye Diggs, 38, and Idina Menzel, 37, are expecting their first baby, his rep confirms to PEOPLE.  —  The longtime couple …

Will Arnett joins ‘Jonah Hex’  —  Michael Shannon also comes aboard action Western  —  Will Arnett and Oscar nominee Michael Shannon are boarding “Jonah Hex,” Warner Bros. and Legendary's action Western based on the DC Comics character.  —  Jimmy Hayward is directing “Hex,” …

Postal Service Announces ‘Simpsons’ Stamps  —  The FOX hit series The Simpsons will be commemorated on 44-cent First-Class Mail stamps in 2009.  Featuring the iconic Homer, Marge, Bart, Lisa and Maggie Simpson the stamps have been personally designed by Simpsons creator and executive producer, Matt Groening.