Pop Tarts: The Mary-Kate Olsen Diet: Dye Your Hair Blond

Forget exercise and calorie-controlled diets, Hollywood’s best-kept weight loss tip is simple: Just dye your locks blond. Well, at least according to Mary-Kate Olsen’s publicist.

“The blond hair she has now makes her look skinny,” her rep claimed, according to IMDB.com.

Olsen made a shock-factor entry at a Golden Globes after-party when her low-cut dress exposed her bony 80-pound frame.

“She looked terrible,” one onlooker said. “All washed out and fading away.”

Olsen was first treated for anorexia in 2004, but her rep slams reports the disease is back.

“Mary-Kate has not lost weight. She is taking good care of herself,” she said.

Rachel McAdams Goes 'Pink' at SAG Awards

Speaking of hair color, could this be the latest fashion statement?

Rachel McAdams looked like anything but a "Mean Girl" in a ravishing bright-pink gown at the 13th Annual SAG Awards in Los Angeles Sunday night.

But in a trendy twist she topped the frock off with matching pink locks.

Wonder if she'll change the color to match her Oscar gown: Boyfriend Ryan Gosling is nominated.

Justin Timberlake Brings Sexy Back With Jessica Biel

Fresh from his split with Cameron Diaz, the former *NSYNC hottie seems to be swooning in "7th Heaven" with Jessica Biel.

Biel has apparently joined the Timberlake family on a snowboarding holiday in Park City, Utah. The actress was spotted last Thursday on her way to visit Justin in a chauffeur-driven Volkswagen, and the two got cozy on the slopes later that day.

“Justin’s a romantic guy and knew there was an unmistakable chemistry between them,” an insider told the U.K.'s Daily Mirror. “He took the opportunity to invite her snowboarding with him so he could see if they can take this further.”

But are they both just on the rebound?

Timberlake and Diaz have only recently parted ways, while the fling between Biel and Derek Jeter seems to have died a sharp death after reports of the Yankee getting swanky on the dance floor with "Bring It On" actress Gabrielle Union.

But don’t fret for Cameron, she’s riding the waves of romance with pro-surfer Kelly Slater. While Biel and Timberlake are snowboarding, the others are currently soaking up some sunshine in Hawaii. Awww.

Duff Stuff

Newly single Hilary Duff is seeking "The Perfect Man" after breaking up with Good Charlotte rocker Joel Madden.

Duff told Ryan Seacrest last Thursday that she’d been on a date with an anonymous Tinseltown resident, which was something new for her.

“It’s kind of exciting,” she said. “I’ve never got to date before. I’ve always just had a boyfriend before, you know? I’m young!”

Like, yeah, we know, Hilary. After middle school, you usually get to know someone a little first before you’re an item…