Justin Timberlake and Jessica Biel are said to have gathered friends and family for an intimate ceremony at a secret location in Italy this week.
Another source told Life & Style magazine guests do not even know the exact venue beforehand and "were told just to fly to Italy."
The source added, "Save-the-dates went out in the spring and little information was given. Guests were warned that any phones or cameras would be confiscated, so best to leave them at the hotel."
The couple have been dating for five years and engaged for ten months - Justin proposed during a Christmas holiday break in Jackson Hole, Wyoming.
In February sources said the couple had been meeting with a wedding planner and Jessica, 30, had reportedly "told Justin she wants to get married outside at sunset."
The 'Total Recall' actress was also seen in a bridal boutique in Paris "in a really good mood" earlier this month.
Justin also had a bachelor party in September, which started in Las Vegas and made its way to Cabo San Lucas in Mexico.