The late-night host was reportedly by his mother's side with his immediate family when she died on Nov. 4 from an undisclosed illness. At the top of the hour, he paid tribute to his late mother, recalling a beautiful childhood memory.
"When we were little, my mom would walk us to the store, and we would hold hands. And she would squeeze my hand three times, and say 'I love you,'" a teary-eyed Fallon told the audience. "Last week, I was in the hospital and I grabbed her hand and squeezed 'I love you.' I just knew we were in trouble."
DiCenzo said no one on the crew had listened to "New Years Day" beforehand and didn't anticipate the connection, describing it as a "beautiful coincidence in a beautiful performance."
"I think everyone in the audience started sobbing," he wrote. "I could see Jimmy silhouetted at his desk dabbing his eyes with a tissue. We all lost it."
"That hug between Jimmy and Taylor after the song was 100% real emotion," he added. "Whatever you think of Taylor, she did something beautiful for Jimmy and our show today, and we're forever grateful."
No, YOU'RE crying.
Watch the full performance below.