Behold the cuteness: Leonardo DiCaprio (left) in the late '70s with his stepbrother, Adam.
Proof of Cuteness #1: Super '70s bowl-meets-bob cut.
Proof of Cuteness #2: Tight-lipped smile.
Proof of Cuteness #3: Attachment to objects.
Proof of Cuteness #4: That freakin' jumpsuit.
Proof of Cuteness #5: And the fact that it is ever-so-slightly too small.