It’s October 3rd, which can only mean one thing … it’s “Mean Girls” Day! And for today’s Guess Who, you’re getting a double dose of Burn Book royalty.

On the left, we have a child whose limit does not exist … because she’s been an A-list actress since she was a kid.

And on the right, we’ve got the tiny tot who will grow up to become the heartthrob of North Shore High.