One World: Together at Home is happening Saturday (April 18), and Lady Gaga is full of emotion. "I love you all so much. I love the world so much," she said on Instagram Live, wiping tears from her eyes as the day's live stream began. "I'm so grateful to all the healthcare workers and the medical workers and all the grocery store workers and delivery people and the postal workers [and] all the other non-profits that are working so hard," Gaga added. "I just want you to know that this is really a true love letter to all of you all over the world," she continued, "and I hope a reminder to the kindness that's occurring right now." World Health Organization and Global Citizen teamed up for the worldwide event, in collaboration with Lady Gaga,