Justin Timberlake, Scarlett Johansson Rumors Heat Up

Justin Timberlake doesn't waste any time.

Word that he and long-time girlfriend Cameron Diaz have broken up is barely making the rounds. But JT may be delving right into the arms of an even more beautiful actress.

Anyone who has seen the former boy bander's latest video for "What Comes Around" knows who we're referring to: Scarlett Johansson. It should come as no surprise that she's agree to star in it.

"Scarlett has always liked Justin. They've always had a flirtation â€" that's why Cameron was threatened by her," a source told Us Weekly.

According to this friend, the decision to cast the 20-year-old as the video vixen pushed Timberlake's relationship with Diaz to the breaking point.

From there, Johansson to moved in for the kill like Anna Nicole Smith jumping on a single man with money.

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

Indeed, sources in both stars' inner circles tell Us the couple is in the beginning stages of a relationship. We guess this is better than if Justin had accepted the offer from Paris Hilton and Kim Kardashian.