Big-voiced singers Ariana Grande and Christina Aguilera teamed up for an action-packed duet on last night's finale of The Voice. Talk about two dangerous women!

The tiny 22-year-old singer began her performance with her new single “Into You," which then morphed into her hit, "Dangerous Woman," which X-tina, who is a coach on the hit show, joined in on. What a show-stopping performance!

It was quite a night for the blonde bombshell -- her contestant, Alisan Porter, took home the big win, which also marked Aguilera's first win and the first victory for a female coach on the show. What a night!

And just an FYI: the night's big winner, Allison Porter was a child star back in the day -- she portrayed the title role in Curly Sue.

Moments after her big win, Alisan, who has two children, told reporters, "I have retired Curly Sue, she is dead! I am now the girl who won The Voice." She added, "I would like you all to know. I've waited 30 something years for that! She's dead!"