The photo, which was actually shared from Boomer's own Instagram (what a tech savvy tot!), features the doting dad and his son with the caption, "Daddy day!!!"
Cue the exploding hearts!
The photo features the shirtless 31-year-old snuggling up to his 1-year-old son in his kitchen. The two make quite the precious pair!
In addition to spying the abs of steel, you can almost see the top of Phelps' Olympic rings tattoo, famous for peeking out of his bathing suit.