Justin Timberlake and Scarlett Johansson Party in Miami  2/6/07

Justin Timberlake's love life is getting a little confusing - just 10 days after he was spotted romancing actress Jessica Biel at the Sundance Film Festival in Utah, the pop stud partied with Scarlett Johansson at the Super Bowl.

Rumors Timberlake was dating the star started circulating after Johansson appeared in the singer's new video.

But then Biel seemed to have won Timberlake's heart after he was spotted wooing the actress at Prince's post-Golden Globe Awards party in Los Angeles (15JAN07). A week later, the singer jetted the actress to be by his side at the Sundance Film Festival, where the couple hit the party scene.

But then, over the weekend (03-04FEB07), Timberlake and Johansson were spotted together again in Miami, Florida.

An insider tells America's In Touch magazine, "They spent the whole weekend together."

The couple was spotted at a post-Super Bowl party at hip Miami club Mokai.

The source says, "They were dancing and whispering in each other's ears. They were having a really good time together."

Fellow revelers watched the couple leave the party hand in hand and head back to the Delano hotel, where Timberlake was staying.

What Comes Around - the video that may have sparked a romance between Timberlake and Johansson - will debut during the Grammy Awards pre-show coverage on MTV on Sunday (11FEB07).