The couple wed in a civil ceremony in Buenos Aires, Argentina, on Thursday, according to People, with Bublé, 35, decked out in a grey suit and Luisana in a violet dress with silver high heels.
The bride carried a bouquet of purple orchids which she threw into the crowd after the ceremony. It is thought they will continue their celebrations with a party for 300 guests at a mansion outside Buenos Aires this weekend.
The pair first clapped eyes on each other at a concert in Buenos Aires in November 2008.
A source told People, 'They met at a party the record company threw for him after his show in Buenos Aires.
'The head of the label wanted to introduce Michael to Argentina's most famous actress. When he met her, he said it was love at first sight.'