Everyone has been speculating about the hottest hookup in South Beach. It would seem that Jessica Biel is out of the Justin Timberlake stakes and Scarlett Johansson is back on as the number one gal interest.

According to reports, Saturday night Scarlett went out to the CAA party at Miami hot spot Mokai where she was seen partying with the likes of Justin Timberlake's best friend Trace Ayala and his crew.

Kid Rock and Matt Leinart both attempted to distract the young Scarlett but she was having none of it. Although Timberlake was not in attendance at the party, the two eventually did hook-up later on in the night.

Snoopers spotted Timberlake leaving Johansson's bungalow at the Shoreclub hotel around 7am.