The video sees Fletcher climb into the loft to find an old games console.
Not long after, his wife, him and Buzz are sat in the living room choosing their players for the game - which are listed as the family members.
Sure enough, a fourth player with a '?' in the box is shown on screen.
The camera then zooms in on Giovanna who has a baby's scan resting on her belly.
The video was instantly picked up by fans, achieving more than 3,000 shares in 20 minutes and hundreds of congratulations messages.
Just like the many others, we're guessing this one is going to go viral.
The couple welcomed their first son, Buzz, in March 2014. They wed in 2012.