Jack Harlow's currently dominating the Billboard Hot 100 -- but says the real celeb is his pet pooch ... and he's got a tight leash on the animal's true identity, which he won't reveal.
We shot the breeze with JH in Bev. Hills this week as the Kentucky-born rapper's hit is killing the charts -- his "Lovin On Me" smash hit returned to #1 for the sixth time this week ... and Jack humbly tells us he's currently the act to beat in the rap game.
He totally has the motion to back it up ... his cameo in Ben Affleck's star-studded Dunkin Donuts ad earned high marks on Super Bowl Sunday -- allowing for all the exclusive merch to sell out in minutes!!!
Jack says Ben's relatability made shooting the spot easy-peasy... apparently, they gelled through their connection as actors -- something JH says he appreciated as they collab'd.
Jack's clearly not running from the limelight but when we asked his dog's name, he refused to give it to us ... out of respect for her privacy!!! Aww ...
