In the new issue of Life & Style Weekly, on newsstands now, Timberlake was snapped hanging with family and friends at dinner on Wednesday night.
"The group took in a beautiful 10-minute fireworks show," an insider told Life & Style. "Everyone also dined on everything from pasta with clams and shellfish to octopus and vegetables."
On Thursday, an eyewitness told E! News that the couple was part of a big group that went to a grotto in Lama Del Trappeto.
The guests reportedly relaxed around open fires and munched on cheeses made in the grotto, milk from goats, local olives, ricotta and wine from the area.
Check out "Extra's" interviews with bride-to-be Biel, in which she gave some hints to the big day!
Soon-to-be newlyweds Justin Timberlake and Jessica Biel are enjoying their time in Italy before they exchange vows this weekend.