Talk about just a beautiful yet sad moment Ariana Grande had at her show last night in Pittsburgh. Ari took to the stage for her Sweetener tour in Mac Miller's hometown and as she was singing the line about him from "Thank U, Next," she began to sob. What's remarkable is how strong Ari is when she recovers and begins to powerfully sing her song after, knowing that the best she can do is keep going. But, it didn't go unnoticed by fans of both Mac and Ari's in Pittsburgh that the two truly had something very special and unfortunately the world lost Mac too soon. You can watch the video below, but prepare to be a little teary eyed after.