Jack tweeted a picture of their mutt last night (29 September) and told fans how they had adopted him from an animal shelter in California.
The couple's brown and white dog looks seriously delighted to be an Osbourne too. Is it just us or is he smiling in Jack's snap?!
Commenting on his photo, Jack said: "I'd like everyone to meet Ranger Osbourne. He's the newest member of my family, by way of the East Valley Animal shelter. #rescue."
What a cutie!
Jack and Lisa married in Hawaii in October 2012 and they have a daughter together, Pearl, who was born in April of the same year.
Pearl is no doubt going to love her new playmate!
Would you rescue a dog? Tell us below, as the best comment from across the website each week wins £50.