Leno started by flashing a childhood family photo of Adam and then proceeded to ask Levine when he first started performing for audiences before rolling footage of a baby-faced Adam lip syncing and gyrating to Bobby Brown's '80s jam.
Levine was caught on camera bumping and grinding to the R&B bad boy's track in an over-sized t-shirt, ripped jeans, leather jacket and fitted cap.
When the video cut away, Adam shook his head in shame and could only say "wow" at Leno in disbelief. Hey, at least there were no naked baby on a bear skin rug photos! Check out the hilarious home video below!
Watch Adam Levine on the 'Tonight Show.'