The couple, who have been dating for five years, are planning to wed in the European country and Biel has been busy planning every detail of their big day, reported Femalefirst.
"Jessica has claimed she is too busy to plan a wedding but she actually has been very involved in all the details, like every bride," a source said.
Wedding planner Diana Sorenso recently planned some nuptials at 19th century boutique hotel Palazzo Margherita and claims the star-studded nuptials will be held there.
"I've heard the wedding will be intimate, in the palm-tree lined outdoor garden area, just aside from the stunning black bottom pool and giant pergola. There will be flowers galore and it will be extremely elegant - the most stunning the palazzo has seen yet," she said.
