According to reports, the Monegasque royals will take part in a Roman Catholic ceremony on 1 February in the German-speaking village of Gstaad in Switzerland.
While the news has not yet been confirmed by Andrea's mother Princess Caroline or Monaco's royal household, the union is said to be held at the church not far from Gstaad.
Reports also suggest that the couple, who are parents to nine-month-old baby Sacha, are hosting a pre-wedding fondue party on Friday 31 January, at the alpine restaurant Berghaus Eggli, and a wedding brunch on 2 February at the Palace Hotel.
The celebrations are expected to be conducted privately, with guests reportedly including Princess Charlene of Monaco, fashion heiress Margherita Missoni and Italian socialite Bianca Brandolini.
Royal watchers will also been keen to see if Andrea's sister Charlotte Casiraghi will attend the wedding, having recently given birth to a baby boy named Raphaël.
The Swiss village of Gstaad and The Palace Hotel
The Swiss location holds particular significance for 30-year-old Tatiana, who attended the prestigious boarding school Le Rosey in Gstaad.
Andrea's grandfather, Prince Rainier of Monaco, was also educated at the school as were numerous royals including Prince Guillaume of Luxembourg, King Albert II of Belgium, King Juan Carlos of Spain, Princess Marie Chantal of Greece, Prince Aga Khan and the Duke of Kent.