The couple's little boy, Noah, turned one yesterday (27 August) and Luisana marked the occasion by posting the romantic photograph on Instagram.
In the snap, Luisana is wearing a white lace bra and open denim shirt, meaning her bare baby bump is on show, and she is cuddling in to the Canadian crooner.
Commenting, she wrote: "Thank you @michaelbuble for making me the happiest woman in the world!!! #happybdayson #proudmom #canadianargentinianbaby."
Michael, meanwhile, has posted a picture of himself and Noah fast asleep in an armchair.
Hinting that they'd had a good knees up for the birthday boy, he said: "Oh boy did we party hard last night !! Like father like son hahha!!!"
Michael and Luisana tied the knot in April 2011 and revealed they were expecting their first child together, Noah, in January 2013.
Instead of just tweeting the news, Michael and Luisana announced the pregnancy in a cute video, which they posted on YouTube.
Soon after Noah's birth, Michael jetted off on his 'MB World Tour', meaning his son got to travel the world before his first birthday! Baby Noah has been to Germany, Barcelona, and Australia to name a few!
Watch Michael warm up for one of his gigs by singing Bruno Mars' hit 'The Lazy Song' here: