Justin Timberlake and Cameron Diaz, who announced last week that they’d split up, got into a heated argument at Prince’s Golden Globes afterparty early Tuesday morning.

The exes, who’d chatted politely during the awards ceremony and even shared laughs at InStyle’s annual afterparty, hit the rough patch in their officially amicable breakup at a wee-hours bash hosted by the singer at the Beverly Wilshire hotel.

According to witnesses, Timberlake was chatting with actress Jessica Biel when Diaz approached. Biel stepped away, and the former couple had a serious exchange.

Diaz walked away, Timberlake followed, and the two were soon spotted engaged in an intense 40-minute face-off in a side room.

Diaz reemerged looking composed, but not before Timberlake held his head in his hands and, says a witness, “slammed his fist (down) into a cabinet.”

The NY Post also reported the same fight,

CAMERON Diaz is not over Justin Timberlake just yet, and things got heated when she saw her ex chatting up Jessica Biel in L.A. after the Golden Globes. Sources say the temperamental star “blew up” at Biel after she saw Timberlake flirting with her. Diaz followed Timberlake to the In Style party at the Hilton Oasis, where “they had an awkward conversation.” The “Charlie’s Angels” star then trailed Timberlake to the Beverly Hilton rooftop for the Universal party, where she found him chatting up Biel - and screamed at the “Illusionist” star. “If that’s how she wants to get him back, it won’t work,” said our insider. “She’s desperate.” Reps for Diaz did not return our call.

I can’t imagine it’s easy to break up with someone after 4 years…I feel bad for both of them.

Although Justin Timberlake and Cameron Diaz announced yesterday that they had ended their romantic relationship, signs of the split had been evident for weeks.

During Monday’s kickoff of Timberlake’s 36-date FutureSex/LoveShow tour, the singer said midway through the show, “Sometimes love isn’t so easy,” giving the crowd a clue in to his personal life.

Meanwhile, Diaz went solo to Tuesday’s People’s Choice Awards, where she won the trophy for favorite leading lady.

The pair were last seen out together Dec. 16 in New York City celebrating Timberlake’s appearance on Saturday Night Live. The singer, 25, then flew home to Tennessee for the holidays while Diaz, 34, stayed in L.A. and then skied in Vail, Colo.

Diaz was also noticeably absent from the Jan. 3 premiere of Timberlake’s movie Alpha Dog. Instead, he brought his mom as his date – and was spotted engaging in cozy conversation with Scarlett Johansson, who recently filmed a video for one of Timberlake’s new songs, at a party afterwards.

“He called me around Christmas to say they had broken up,” a pal of Timberlake’s told PEOPLE. “They’re not talking to each other because things are a little awkward.”

A source close to the couple said part of the problem was: “I don’t think she’s so much into the scene like he is. He’s really young and he likes to go out. (He) hasn’t been into her for awhile.”

During his New York City visit with Diaz in December, Timberlake was spotted partying with two blonde models. At Christmas, he spent time in Memphis with ex-girlfriend Veronica Finn. (Finn, a Florida-based real estate agent, says he’s just “an old friend.”)

But don’t expect fireworks, says Timberlake’s pal. “They were laid-back together, so it’s not going to be an ugly breakup. This is just them realizing it was time to move on.”

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• Celebrity lookalikes - so good, you can hardly tell their fake!
• Vintage Britney Spears pics. Ah, back when she used to be kinda cute.
• Paris Hilton autographs a gas can.  Now that’s hot.
• Tori Spelling looking highly unfortunate.  Maybe she can’t afford a stylist anymore.
• Elisha Cuthbert with a hockey stick.
• Nicole Richie looking 1/2 decent in a bikini?
• Patrick Dempsey in one of the cutest pictures I think I’ve ever seen.
• Watch Popbytes and his 30 Seconds to Blog.
• Holy cow, you’re never gonna believe what Fred Durst looks like now!
• Move over Barbara, Oprah is going to have her own Oscar special.
• Madonna defends Rosie. Aw, how cute.
• Lindsay Lohan running. In a bikini. In wedges. With a lit cig in her hand.
• Derek Jeter and Jessica Biel gettin cozy.
• Is Sasha Baron Cohen actually hot?

And - in other news….Cameron Diaz and Justin Timberlake have CONFIRMED their breakup.  TMZ is reporting that they released a joint statement:

“It has always been our preference not to comment on the status of our relationship, but, out of respect for the time we’ve spent together, we feel compelled to do so now, in light of recent speculation and the number of inaccurate stories that are being reported by the media. We have, in fact, ended our romantic relationship and have done so mutually and as friends, with continued love and respect for one another.”

When Justin Timberlake, 25, was casting the femme fatale for his new $1 million video, “What Goes Around,” the singer – who was on the rocks with 34-year-old girlfriend Cameron Diaz — went after one actress: Scarlett Johansson. And Johansson readily agreed, an odd choice for the seasoned thespian who’s known for her careful film choices.

But not if you have a crush on the leading man, says a pal of Johansson.

“Scarlett has always liked Justin. They’ve always had a flirtation – that’s why Cameron was threatened by her.”

With good reason. The decision to cast the 20-year-old as the video vixen pushed Timberlake’s relationship with Diaz to the breaking point, and paved the way for Johansson to move in for the kill.

“She could not believe he went behind her back to put her in the video,” says a Timberlake pal. “Cameron was very jealous of Scarlett.”

Adds the source, “they definitely got together after she did the video.”

Indeed, sources in both stars’ inner circles tell Us the couple are in the beginning stages of a relationship and excited to get to know each other.

Where did Cameron’s long-standing rivalry with Scarlett begin? How is Cam coping with the Justin’s newfound romance? What happened during Justin’s sexy encounter with Kate Hudson when he attended her New Year’s Eve bash? For more details on Cameron and Justin’s split and his budding romance with Scarlett Johansson, check out the new issue of Us Weekly, on newsstands this week?

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This is my favorite part of the cover…how funny is THAT!

Justin Timberlake confirmed he’s split from girlfriend Cameron Diaz but tells The Toronto Star he “can’t talk about it.” Freelance reporter John Hiscock got that sweet little nugget out of JT at the premiere of Alpha Dog on Wednesday, January 3, to which Justin brought his mom as his date.

People reports that after the premiere Justin took off for L.A. hotspot Social Hollywood for an hour long “one on one” with freshly on the market Scarlett Johansson. The two are appearing together in Justin’s video for “What Goes Around.” We don’t want to say it was a date but… but we don’t know how else to finish that sentence. Flirt, Scarlett, flirt like the wind!

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 The singer gave heartbroken star Cameron the elbow out of the blue before the New Year and then met Scarlett who stars in the video for his upcoming single What Goes Around.

The two were working on the promo all last week — and have been spending a lot of time together off the set in Los Angeles. A source told me: “Things just didn’t work out between Justin and Cameron.

“They decided to part ways — but they didn’t tell anyone.

“He’s got a tour coming up this year and wanted to concentrate on that, but it seems he’s really hit it off with Scarlett while working on the video.”

On Wednesday, 2nd January, Scarlett was at the after-party for the premiere of Justin’s new movie, Alpha Dog, at Social Hollywood in LA.

Our source said: “She walked in keeping her head down. When she met Justin they looked very close and chatted away for ages.

“There were other people trying to speak to Justin but he kept his attention on her for around an hour. They looked very intimate.

“But he’s still trying to make it look low key—because he left with his mum Lynn later through a back exit.”

Justin, 25, was still with Cameron when he asked Scarlett to play the leading lady in the vid believed to be based on his relationship with Britney Spears.

And with their curly long blonde hair, big eyes and curvy figures, there are definite similarities between the two beauties.

Justin dated Britney for four years after they met on the Mickey Mouse Club TV show. But in March 2002 it ended abruptly when Brit was accused of cheating on him with her choreographer.

More after the jump! (more…)

But here is Justin at the premiere of his new movie, “Alpha Dog” last night - ALONE.  Where’s Cameron? I was probably the only one who actually liked them together, but I did.  I thought they were cute.

Let’s take a moment of silence.