Janet Jackson had reportedly enjoyed a steamy affair with Justin Timberlake, reports celebrity portal Femalefirst.

The singer, now dating record producer Jermaine Dupri, allegedly romanced Justin - 15 years her junior - before their infamous Super Bowl performance last year during which Jackson had accidentally bared her breast.

Nick Cassavettes, director of Justin's new movie "Alpha Dog", was quoted by Britain's Daily Star newspaper as saying that Justin, who is currently dating actress Cameron Diaz, had turned down the Super Bowl show three times but only relented because he once had a romance with Janet.