“Happy Mothers Day. Me and Rocky win,” the Boardwalk Empire star, 47, captioned the sweet snapshot.
In February, the proud papa posted a photo with their baby boy while he celebrated his milestone birthday Down Under.
“Happy Birthday my beautiful boy #therock #1,” the Blue Jasmine actor captioned the image at Bondi Beach in Sydney, Australia.
The Ant-Man star and the Neighbors actress, 37, welcomed their first child together on Feb. 1.
Cannavale is also dad to 22-year-old son Jake with ex-wife Jenny Lumet.