Once backstage, Missy introduced Mary to her Instagram followers.
Over the summer, Mary went viral with a karaoke version of the hip-hop track, and when Missy spotted the footage, she posted the video to social media, calling Mary her "funky white sister".
On Thursday's episode of The Ellen DeGeneres Show, Elliott had the opportunity to meet her super fan from Rhode Island. And the reaction that I got was so positive that it became my go-to [karaoke] song, ' Mary told the show host. And although she knows what the lyrics mean, she "wasn't thinking about them" when she was singing them.
"First I want to thank Ellen for just being incredible she will always be blessed because of her HUGE Heart!,' Missy said on Instagram following the show".
"It was a shock, I never expected this", said Halsey about going viral and getting a response from Missy for the original video.
Of course, we have to thank Ellen DeGeneres for doing the Internet a solid.More news: China says Washington asks to resume talks on tariff fight
Missy Elliott met her long lost sister on Ellen - her funky white sister, that is.
Missy Elliot dueted "Work It" with a fan who has been slaying her song in karaoke for 15 years.
Now Elliott and Halsey have officially performed the classic song together.
Sitting down for a chat, an overwhelmed Mary admitted: 'I can hardly just sit here, you've blown me away.
In the end, not only did Missy give Mary a signed T-shirt, but Ellen also gave her a jacket that had the words "Missy's Funky White Sister" emblazoned on the back. I thought it was just the most incredible thing.