Britney says K-Fed her 'biggest mistake'  —  Plus: He'll get big bucks, plus kids four out of seven days  —  Britney Spears and Kevin Federline have hammered out the details of their split, and it's reportedly going to cost the "Toxic" singer $13 million.  What's more, Star magazine …

Hayden Panettiere: Don't Call Me Lindsay!  —  "Heroes" cheerleader Hayden Panettiere was mistaken for Lindsay Lohan last night — and was she ever pissed!  —  TMZ spotted Hayden leaving Hollywood hotspot L Scorpion last night with co-stars Milo Ventimiglia and Leonard Roberts …

Exclusive: The Hills' Heidi Montag Gets Implants  —  Now there's even more to love about Heidi Montag, star of the MTV reality show The Hills.  —  Usmagazine.com has learned exclusively that Montag, 20, underwent breast augmentation surgery on Monday at the Beverly Hills office of plastic surgeon Dr. Frank Ryan.

STAR EXCLUSIVE!  K-Fed's Younger Brother in Jail for Boozing!  —  In June 2005, Britney Spears and then-hubby Kevin Federline attended the high school graduation of his younger brother, Cameron Federline, in Cameron's hometown of Pendleton, Oregon.  Now fresh out of rehab …

Lindsay & Hilary: Burying the Hatchet  —  They famously feuded over singer Aaron Carter, 19, (who dated them both), but Lindsay Lohan, 20, and Hilary Duff, 19, put it all behind them at Hollywood club Les Deux on March 30.  Lohan hugged Duff and partied by her side.  —  So where did the bad blood begin?

Did Keith Richards Really Snort His Dad's Ashes?  No — It Was A Joke!  —  Comments made in magazine interview were only 'said in jest,' manager tells MTV News.  —  Maybe you saw that Keith Richards item that started popping up all over the place on Tuesday (April 3) …

COVER STORY: Valerie Bertinelli Says 'I'm Fat'  —  Valerie Bertinelli, best known for her 1975-84 sitcom One Day at a Time, has landed a brand new role: Joining Kirstie Alley as the new celebrity face - and body - for Jenny Craig, PEOPLE reports in its new cover story.

One Doctor Prescribed All 11 Prescriptions In Anna Nicole's Hotel Room  —  One doctor authorized all 11 prescription medications found in Anna Nicole Smith's hotel room the day the Playboy Playmate died of a drug overdose, according to documents released by the medical examiner's office Wednesday.

Scarlett Johansson's Nude Ban  —  Trying to figure out the truth when it comes to seeing Scarlett Johansson nude is just about the hardest thing a blogger can do.  One day you hear that all it would take for Scarlett Johansson to get naked on screen is the right part, the next she says she won't ever do a nude scene.

"Project Runway" Hits Turbulence  —  TMZ has learned that L.A. casting for the new season of "Project Runway" was a fashion disaster!  —  Sources tell TMZ that auditions held this weekend at the downtown Standard Hotel had a record low turnout.  We're told that since lines were not very long …

From 'Sex & the City' to echh! in the park  —  That's no crazy lady rooting through the trash, that's Cynthia Nixon!  —  A visitor to Riverside Park last Thursday threw out an empty Ziploc bag that had contained some candy.  "A woman got up off the bench and fished through the garbage to get my Ziploc," she says.

Tori Talks: How Angelina Helped My Birth  —  Last month marked the most frenetic time of Tori Spelling's life.  On March 13, the star of Tori & Dean: Inn Love gave birth to son Liam, her first child with husband of 11 months, actor Dean McDermott, 40.  —  But Liam didn't come easily.

Tony Bennett Pulls Out Of 'Idol' Appearance  —  The show won't be going on for Tony Bennett on tonight's "American Idol."  —  The legendary crooner, who turned eighty a few months ago, is not well enough to put his golden pipes on the air.  —  According to a spokesperson for the star, he has a cold.

PARIS DUI SKETCH CLIPPED  —  PARIS Hilton acted in an MTV comedy sketch featuring a drunk ditz getting pulled over for DUI - but last week, her lawyers threatened to sue the network if it wasn't deleted from tomorrow's debut episode of "ShortCircuitz."  Viewers of the sketch comedy show …

Kate & Owen's Romance: The Real Deal  —  After months of playing it cool, Kate Hudson and Owen Wilson are turning up the heat on their romance - with his brother Luke's blessing  —  "He seems very happy," says Owen's younger brother, actor Luke Wilson.  "[Kate] is a very nice girl."

Travolta in jet scare  —  HOLLYWOOD star John Travolta made an emergency landing in his private Qantas jet after it was hit by engine problems.  —  The Pulp Fiction actor, 53 - a qualified pilot - was flying the Boeing 707 himself when it was hit by the mid-air scare.

SPLITSVILLE FOR ZAHN, HUBBY  —  JUST three weeks after Page Six ran a blind item about their crumbling marriage, Paula Zahn and her husband, real-estate magnate Richard Cohen, have filed for divorce.  The blind item asked, "Which TV news anchorwoman is about to get separated from her husband?

Queen Sanjaya Will Reign!  —  American Idol sucks plain and simple.  I have a love/hate relationship with it.  I hate myself when I'm watching it, but I can't NOT watch it.  I think I've been hypnotized by Melinda DoLOTS' no neck.  —  Anyway, last week I guessed the bottom 3 right, but effed up on who was actually going home.