The beautiful story behind Taylor Swift's performance on Jimmy Fallon.

It’s a good day for good people doing good things.

In case your heart isn’t already warmed by the celebrations post yes-vote, Taylor Swift’s performance on The Tonight Show with Jimmy Fallon might just leave you a bit teary-eyed.

The Monday night performance was a pivotal one, considering it was the first episode Fallon hosted since his mother Gloria’s sudden death on November 5.

In a series of tweets shared by writer and producer for The Tonight Show, Mike DiCenzo said that although Swift wasn’t scheduled to perform, when asked she did so “with zero hesitation.”

Debuting her single ‘New Year’s Day’, the line “you squeeze my hands three times in the back of the taxi,” was clearly emotional for Fallon, who earlier in the show had shared personal stories about his mother.

“She was the best, she was the one I was always trying to make laugh, and she was such a fan of the show,” he began.

“When we were little my mum would walk us to the store, me and my sister, and we would hold hands, and she would squeeze my hand and say ‘I love you’, and I would squeeze back and say ‘I love you’,” his voice breaking.

“Last week I was in the hospital, and I grabbed her hand and squeezed, ‘I love you,’ and I just knew we were in trouble.”

DiCenzo said that nobody on the staff knew of the story of Fallon and his mum.

“I could see Jimmy silhouetted at his desk dabbing his eyes with a tissue. We all lost it. It was a beautiful coincidence in a beautiful performance,” he said on Twitter.

If you watch to the end of the video, there’s a beautiful moment between Fallon and Swift, that DiCenzo called “100% real emotion,” that’s sure to make you smile, even just a little bit.

World, we like you today. Very much so.

LISTEN: Mamamia Out Loud: Look What Taylor Swift Made Us Do