Watch Jennifer Hudson Sing Dreamgirls Duet with Glee Alum Amber Riley

Chris Millard/Warner Bros. Amber Riley, Jennifer Hudson

Amber Riley joined Jennifer Hudson for a knockout version of the Dreamgirls song "And I Am Telling You I'm Not Going" on The Jennifer Hudson Show Monday.

Former Glee star Riley, who won The Masked Singer last week, both have ties to the role of Effie in the musical. Hudson's Effie was an Oscar-winning career-maker in 2006 for the American Idol alum, while Riley took to the London stage in the role in 2016.

Before the performance, Riley recalled when Hudson joined her in London for the Dreamgirls opening night.

"You'd best believe I was going to be there," Hudson said. "I made a point, I said I got to go see Amber in this. It was amazing. Beautiful job."

On Instagram Monday, Riley shared the clip and wrote, "A 'DREAM' come true! Thank you for always being so kind to me and always supporting me, and for being such a powerhouse trailblazer. I love you @iamjhud!"

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from celebrity news to compelling human interest stories.

RELATED: Amber Riley Says She 'Didn't Really Know Where I Stood' on The Masked Singer Before Winning

Riley felt a kinship with the character: "Playing Effie, I'm sure you became close to that character, like I became close to that character, and really knew her. Having her story be like this gift, and not being able to be out in the front, I feel like doing things like Masked Singer, doing things like Dancing With The Stars, I get to be the winner for those stories, so it's full-circle for me."

Riley wasn't always playing starring roles, though. She used to be a ghost singer.

"Producers used to have me do demos," Riley said. "And also when some artists couldn't do what I did in the demo, they would have the artist come in, and I would imitate that artist to try and fix vocals. ... It's like a ghostwriter. They used to have me come in and say, 'It's just the background' and I'm like, 'No, it's not, it's the lead.' I know my voice when I heard it."