Lindsay Lohan Backs Out of Upcoming Movie  —  Lindsay Lohan, who entered rehab last month, has backed out of an upcoming movie, A Woman of No Importance, her rep confirms to PEOPLE.  —  "She doesn't want to just yes everyone and compromise herself anymore," says her publicist, Leslie Sloane.

Jacko's Kids Unmasked!  —  Michael Jackson's children are usually hiding behind masks ... but not yesterday.  —  MJ's three kiddos; Prince Michael I (pictured here), Paris and Prince Michael II (aka Blanket), were seen without their usual disguises at Circus Circus hotel in Las Vegas yesterday.

Top This  —  Well isn't this a happy sight ... Britney Spears, Isaac Cohen and little Sean Preston out for a lovely day together here in LA earlier this week.  It appears that things are coming along very nicely for BrIsaac ... Isaac actually spends more time with the Federline children than does Kevin Federline himself:

Britney Spears Arrives in Vegas - For Work  —  Britney Spears is in Las Vegas again - but this time, it's business, not pleasure.  —  Sources tell PEOPLE the singer, 25, touched down in Sin City late Tuesday night to work on her upcoming album in the recording studio at the Palms Casino Resort.

HER INNER GODDESS  —  Beyoncé shows off her impeccable style in a Roberto Cavalli gown at a New York City AmfAR gala on Wednesday.  The singer-actress, who presented an award at the event, will be the belle of the ball at her own soirée next week when she hosts the first-ever PEOPLE sponsored pre-Grammy party.

PRETTY AS PIVEN  —  JEREMY Piven likes to joke about why he's 41 and single.  "I'd love to have a girlfriend - if I weren't gay," he tells Playboy's March issue.  "That's right, I'm gay!  I'm gayer than Liberace in 1972."  As to why he's seen as a round-the-clock party boy, Piven adds …

Amanda Bynes Involved in Car Wreck  —  TMZ has learned that actress Amanda Bynes was one of the drivers involved in a multiple car collision in Beverly Hills last night.  —  Police quickly responded to the scene, but no injuries were reported.  The crash brought rush hour traffic …

CREATIVE MOVE  —  THIS explains why style maven Tim Gunn has not yet signed on for the new season of "Project Runway" - he's been lining up a new job.  Expect an announcement today from Liz Claiborne Inc. that Gunn, 53, is joining the firm as chief creative officer, The Post's Adam Buckman has learned.

Natalie Portman, Because She's Natalie Portman  —  Natalie Portman is in Prague premiering her new movie, Goya's Ghost.  I know that's not the biggest gossip story around, but it's been a while since we've posted any Natalie Portman, and, well, it is Natalie Portman.  —  And speaking of Prague.

Patrick Dempsey & Wife Welcome Twin Boys  —  Patrick Dempsey and wife Jillian welcomed twin boys on Thursday, PEOPLE has confirmed.  —  The twins, named Darby Galen and Sullivan Patrick, were born in Los Angeles.  They join 4-year-old sister Talula in the Dempsey household.

Fans Sing to Justin on His 26th Birthday  —  Justin Timberlake's "Future Sex/Love Sounds" concert in Montreal on Wednesday turned into one big 26th birthday bash for the singer - complete with thousands of fans singing and a birthday cake with candles onstage.

Victoria Beckham's Skinny Model Ban  —  Victoria Beckham has banned size zero models from promoting her denim fashion label because it creates the wrong image.  The ex-Spice Girl, who has in the past been nicknamed 'Skeletal Spice' on account of her small frame, has instead hired voluptuous …

Pamela Anderson, Kid Rock Divorce Finalized  —  The divorce between Pamela Anderson and Kid Rock has been finalized, according to court documents obtained by PEOPLE.  —  "It is the mutual desire of the parties to amicably resolve their marital dissolution action," the documents say.

Reese and Ryan Reunited ... for Kids  —  Reese Witherspoon and Ryan Phillippe made their first public appearance together, exactly three months after their October 30 split — which was first reported by TMZ.  The estranged couple accompanied daughter Ava to her school play in Brentwood, and brought younger son Deacon along as well.

Mandy Moore is Full of It  —  Mandy Moore told People that doesn't enjoy dating in the public eye.  So why the hell is she kissing DJ AM in public?  That's bulls**t.  Also, he's gross.  So why is she kissing DJ AM in public? … Gross.  Gross.  Gross.  Mandy Moore should not be kissing DJ AM.

Sweet charity award for Stone  —  NEW YORK — She just received her third Razzie nomination for worst actress, this time for Basic Instinct 2.  —  But Wednesday night, Sharon Stone picked up a decidedly more laudable award for her long-term charity work on behalf of amfAR, which supports AIDS research and prevention.

Rebecca Romijn Is Definitely Not Ugly  —  As if getting Salma Hayek to take her top off and show the world her magnificent breasts wasn't enough, the geniuses behind Ugly Betty just gave you another reason to watch their show.  The extremely underrated Rebecca Romijn has just joined the cast …

Michael Lohan's Letter to Lindsay, and Everyone Else  —  Michael Lohan is keeping it classy and functional as usual by communicating with his daughter Lindsay through the mass media.  Here's to airing personal messages totally unnecessarily.  Obviously, his avenues to communicate with Lindsay …