Arienne Thompson, USA TODAY

With less than a week of marriage under their belts, newlyweds Justin Timberlake and Jessica Biel are already going public with the details of their big day.

Naturally, the happy couple tapped People magazine to document their big day, which took place at the Borgo Egnazia resort in southern Italy on Oct. 19. "It was a total fantasy experience," Biel says of their wedding, which included 100 guests and a special serenade Timberlake performed for his bride as she walked down the aisle.

"It was an original piece I wrote specifically for the evening and for her," Timberlake reveals to People.

And, as far as the wedding reception, Timberlake says their family and friends, including Jimmy Fallon, Andy Samberg and Timbaland, deserved to have a good time.

"It was a lot to ask of them to travel, so we figured we'd give our guests a good party!" he says.

Biel wore a custom, petal pink Giambattista Valli Haute Couture gown, while Timberlake donned a a custom Tom Ford tux, which he also helped design.

The new Timberlake-Biel issue of People is out Friday.