The loved-up couple tied the knot at the town hall in Ravello, on Italy's stunning Amalfi Coast – the place where Gary proposed to 30-year-old Danielle last September.
While it's understood the couple spent just £400 on the simple ceremony, with only two witnesses present, they've hired out a five-star hotel where they will conduct a blessing on Wednesday.
Former air stewardess Danielle is expected to wear a satin gown by Suzanne Neville. Her seven-year-old daughter Ella - from a previous relationship - is to be a flower girl.
Around 100 friends and family have jetted out for the celebrations – which are costing a reported £250,000.
After the blessing, the new Mr and Mrs Lineker will invite guests aboard a luxury yacht for more partying with Duffy apparently providing the entertainment.
It's 48-year-old Gary's second time down the aisle. In 2006, he and his first wife Michelle divorced after 20 years of marriage, having had four sons - George, Harry, Tobias, and Angus.