Cameron Diaz is said to be "distressed" and "angry" over her split with Justin Timberlake - and his friendship with actress Scarlett Johansson.

Despite a joint statement from the pair just a couple of weeks ago saying their break-up was "amicable", sources close to Cameron say the reality of the situation is anything but.

And according to friends the cracks started to show in the pair's relationship when JT announced he'd picked lilo-lipped 20-year-old Scarlett to star in the video for his new tune, 'What Goes Around' (Comes Around).

Cameron ain't Scarlett's biggest fan according to her mates: Scarlett famously starred in Lost In Translation in which her character slated a ditzy blonde character said to be based on Diaz - AND they share an ex in Jared Leto.

A close source told Heat magazine, "Cameron was surprised when she first learned Justin had invited Scarlett to be his love interest (in the video). But when she asked him about it he just laughed and said it was a business decision.

"Cammie said: 'It was the first time we'd had a disagreement like that and I felt something was wrong between us.'"

Not long afterwards the couple split - allegedly in mid-December.

The friend added, "Cammie felt another person was involved. She is very angry and very jealous. When she knew the other person was possibly Scarlett, she was furious."

As we reported recently, Scarlett visited JT at the after-show party of his new flick, Alpha Dog, after which Cameron allegedly got even more upset.

"Cameron said, 'After all this time together, how can he treat me like this?' She is emotionally very distressed," said her mate.

So are JT and Scarlett about to be named the hottest couple on the red carpet? Or are they just good work buddies?

Watch this space. And in the meantime, Cammie, there are plenty more pop hunks in the sea...

'SLJ'