Lohan, 21, was spotted sipping a Shirley Temple with her lobster and fries Friday at Strip House restaurant inside Planet Hollywood Resort with Ronson, who later was spinning at the grand opening of Torrid nightclub inside the Hawaiian Tropic Zone.

Lohan is back in Sin City for the first time since July 15 when she arrived at Pure nightclub inside Caesars Palace one day after completing a six-week rehab stint. Lohan was wearing an alcohol-monitoring anklet. She returned to rehab in October.

Simpson flew in on a Southwest Airlines flight from Burbank on Friday afternoon, a spy told Vegas Confidential. She joined Romo, in town for a former teammate's retirement party.

Simpson, the sexy pop singer who played the scantily clad Daisy Duke in "The Dukes of Hazzard," was met at the gate by a man holding a sign that said "BARDOT," as in Brigitte Bardot, the French sex kitten of the 1960s.

Last week, Lohan created a scene in New York City when she blew up at actress Ashley Olsen of the Olsen twins. The New York Post's Page Six column reported that after Lohan saw Olsen talking to Ronson, Lohan screamed "Get your 15-year-old 'Full House' ass away from my girlfriend."

Lohan and Ronson have long been rumored to be more than pals.

'TOP CHEF' CASTING HERE

Las Vegas is among four cities selected to have open casting calls for Bravo's fifth season of "Top Chef."

Tom Colicchio's Craftsteak at MGM Grand will host aspiring candidates for the reality show from 10 a.m. to 2 p.m. on Sunday, May 4. The Web site is www.craft restaurant.com.

They're looking for self-taught cooks and culinary school grads who have "a passion for food, creativity, a thorough knowledge of cooking techniques and trends and oodles of charisma."

For more information, go to www.Bravotv.com/casting.

THE SCENE AND HEARD

Michael Jackson was working with music producers RedOne and Akon on his new album at the Palms recording studio on Wednesday, Page Six reported Friday. "He's not going to be involved in any personal relationships with women until he gets this record done. He's dumped the nanny (Grace Rwaramba) -- she's not around any more," Page Six quoted a source as saying. ...

Hot spots, cool stuff: The Louisiana State University alumni club will host its Fifth Crawfish Boil at PT's Gold today from noon to 4 p.m. at 3770 S. Hualapai Way. The public is invited. ...

SIGHTINGS

Tina Turner, walking through the Augustus Tower lobby on Friday. She's in town to join Cher on today's taping of "The Oprah Winfrey Show" at The Colosseum at Caesars Palace. ... Bill Self, head coach for the NCAA basketball champion Kansas Jayhawks, being congratulated at every turn after arriving on a flight Friday morning from Kansas City. ... Romo, taking in Tryst nightclub (Wynn) on Thursday. He's in town for ex-Cowboy Marco Rivera's retirement party Friday at the Suncoast pool. Invitees included: Jason Whitten, Anthony Fasano, Cam Cleeland, Joe Andruzzi, Mike Flanagan and Grey Ruegamer. Romo was staying at the Hard Rock penthouse. ... Actress Mena Suvari, dining Thursday at Nove Italiano restaurant (Palms). ... Actress Shannon Elizabeth and "Dancing with the Stars" pro partner Derek Hough, dining Thursday at N9NE Steakhouse (Palms). ... Actor Dennis Miller, at Cirque du Soleil's "Love," on Thursday at The Mirage.

THE PUNCH LINE

"What a beautiful day. It's 75 and sunny ... like Cathy Lee Gifford." -- David Letterman

Norm Clarke can be reached at (702) 383-0244 or norm@review journal.com. Find additional sightings and more online at www.normclarke.com.