Cynthia Erivo pays sweet tribute to 'sister' Ariana Grande after London reunion

Cynthia Erivo has nothing but high praise for Ariana Grande.

On Monday, the 39-year-old British actress and singer shared an emotional message for her "sweet sister" Ariana on her Instagram handle, following their joint concert performance in London over the weekend.

“Ari, my sweet sister, my favourite person to sing with,” Cynthia penned alongside a carousel of glimpses from the show.

“Thank you for inviting me to share your stage, singing two songs that represent such a massive part of our lives." the Grammy-nominee continued.  “This is what we do it for, for the love of the work and for all of the fans. I missed this. We missed this.

“And I wish I had more words, but to put it simply, I will never forget this night. Like a handprint on my heart," she added. “All my love, Cynthia."

In response to the uplifting note, Ariana rushed to the comment section of the post and wrote, “It’ll always come back to this… just as it started"

“I’m so grateful for this moment and for you… Love you always," she added.

On Sunday, Cynthia and Ariana delighted their fans by performing together at London's O2 Arena.