It has been suggested that the pair got married in a top secret ceremony on Saturday.
Web gossip columnist Janet Charlton said of the couple on Saturday: "A source just told us that Justin Timberlake and Jessica Biel are getting married in Jackson Hole, Wyoming as we write this! They pulled a fast one on everybody!
"They are in the middle of their ceremony at a very fancy private estate and members of the wedding party are staying at the Four Seasons Hotel there."
The US ski resort is also where they got engaged at Christmas and according to The Sun, wedding cake designer Sylvia Weinstock has also revealed that she was also present.
The news comes just days after Jessica insisted she had no immediate plans to wed.
She told Us Weekly: "I have no idea. I am one of those people who is not very detail-orientated. In my work and personal life, I'm not one those people who is like, 'This has to be this way, and this has to be this way.' I'm sort of the more big idea person, so I'll probably give an idea and then let it be created."