"I genuinely didn't think this was going to happen," he admits on Ellen. "It's incredible. I keep spontaneously crying. I start crying in the shower this morning; I’m like, 'Oh my God.'"
The daytime host points out how fast he catapulted to fame. "I went to the GRAMMYs last year and I did the carpet and no one knew who I was," Smith recalls.
The 22-year-old R&B singer probably had the more emotional acceptance speeches of the evening, but discloses that his words were all off the cuff. "I didn't rehearse anything that I said last night," he says. "It's just a genuine response. And I'm proud of that."
One of those "genuine responses" included Smith saying he was giving one of his GRAMMYs to Beyonce -- but that's not the case. "That was a lie. I was joking," he quips. "I was joking. English sarcasm."
While he did thank the man that broke up with him and led him to write these winning songs, Smith showed up solo for his big night.
"I'm not [in a relationship.] I was recently, but I split up with him about three weeks ago," he tells Ellen of his current split. "I couldn't bring out In the Lonely Hour and go to the GRAMMYs with someone. I had to be 'lonely' for the GRAMMYs."