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.

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.

Roseanne's Sara Gilbert Expecting Second Child  —  Roseanne actress Sara Gilbert and her partner, TV writer-producer Allison Adler, are expecting their second child, PEOPLE has confirmed.  —  Gilbert, 32, is carrying the child, according to her rep.  —  Adler, 39, gave birth to their first child, son Levi Hank, in October 2004.

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.

Johnny Knoxville Separates From Wife  —  Johnny Knoxville's rep confirms to Usmagazine.com that the Jackass star is calling it quits on his marriage.  "They have been separated," Amanda Silverman, Knoxville's rep, tells Us.  —  Knoxville, 35, and his wife Melanie have been married since 1995 …

Paris vs. Tara — Who Sucks More in Bed?!  —  "Girls Gone Wild" creator Joe Francis went on Howard Stern yesterday dishing about his sexual conquests — which he rated both good (Paris Hilton) and bad (Tara Reid).  —  When Stern asked Francis who gave the best oral sex, he responded …

K-Fed Encouraged to Think Outside the Bun  —  Kevin Federline's Nationwide commercial evidently didn't offend everyone in the fast food business.  While he may have pissed off the National Restaurant Association for insulting their industry, he made a big fan over at Taco Bell.

Katie Holmes: 'I Am Very Grateful'  —  Actress Speaks Out in First Interview Since Marrying Tom Cruise  —  When recounting her husband, her daughter and her career, 28-year-old actress Katie Holmes is filled with gratitude.  —  That's what she told Harper's Bazaar in an exclusive, first interview since her marriage to Tom Cruise.

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 …

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 …

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.

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 …

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.

VIDEO: Tyra Banks Stands Up to Critics of Her Weight  —  Tyra Banks has a message for the critics who have recently poked fun at her figure: "Kiss my fat a—."  —  In front of the studio audience at The Tyra Banks Show, she struts her stuff - wearing the same bathing suit that prompted tabloids …

EXCLUSIVE: J.LO'S DIM & DIMMER  —  'LIGHTBULB CHANGE' TOPS DIVA'S ABSURD LAST MINUTE DEMANDS  —  NOTORIOUS diva J.Lo had studio execs blinking with her latest list of crazy needs including special Lo-wattage lightbulbs, hot Cuban bread and, ooh, lots of Skittles.

Sienna Kicks Ass in 3" Heels  —  Sienna Miller kicked up her heels yesterday — to let a photog have it!  —  The "Factory Girl" star was headed into a NYC building when she was ambushed by flashes, but instead of her usual smile and duck technique, Miss Miller opted for a camera shove perfected by her ex, Jude Law.

Katharine McPhee Gets McUgly  —  American Idol's Katharine McPhee (season 5 runner-up) also made a guest appearance on last night's episode of Ugly Betty.  Kat appears as herself and shows up for Mode Magazine's runway show and signs her self-titled CD (out now) for Betty (America Ferrera) to give to her sister Hilda (Ana Ortiz).

Jennifer Lopez Demands New Light Bulbs  —  Jennifer Lopez stunned recording studio staff by demanding they change the  —  light bulbs before she arrived.  —  The star sent a three-page list of requests to the Westlake Studios in Los  —  Angeles just two hours before she was due to arrive.