A pair of pre-schoolers have warmed hearts online, after a video of their wholesome morning greetings went viral. In the adorable footage, Grace McInerey, 3, can be seen running across the playground into the arms of her best friend, Harper, before sharing a long hug. The two girls then trotted into Indian Ridge Elementary School, Centennial, Colorado, with three-year-old Grace turning around to wave good-bye to her mom along the way.