The 'Dukes of Hazzard' actress - who is currently divorcing pop singer Nick Lachey - was apparently spotted getting close to the funnyman at a Hollywood nightclub last week.
Jessica and Dane were seen getting close at exclusive nightspot Hyde, and according to witnesses neither could "couldn't hide their feelings".
A source is quote on the MSNBC website as saying: "They looked like two people trying not to look like a couple but who really wanted to rip each other's clothes off." The pair - who both star in upcoming film 'Employee of the Month' - first got close on set, but no romance developed because Cook was with long-term girlfriend Racquel Houghton at the time.
Both Jessica and Dane deny they are dating.