The couple, who are already parents to one-year-old son Noah, announced last week that they are expecting their second child together.
On Thursday (16 July), Michael, 39, couldn't resist sharing an image of the baby scan with fans, where he also revealed that he and Luisana won't be finding out the sex of the baby.
Michael captioned the photo: "Good morning world! Today we got the first look at the newest addition to our family! #boy? #girl? #whocaresaslongasitshealthy."
Michael announced he was going to be a dad for the second time last week with his son Noah making a special video announcement.
With Britney Spears' classic pop song 'Oops!… I Did It Again' playing in the background, Michael asked: "Who's that in there?"
Noah then went over to mum Luisana laying on the floor and pointed at her belly, simply saying, "baby!"
Michael and Luisana, 28, married in March 2011 in Argentina and welcomed Noah in August 2013.
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Celebrity babies born this year:
Copyright: Twitter @VanessaLachey