Watch: Nicki Minaj & Ariana Grande Perform "Get On Your Knees" For First Time, Ariana Debuts New Macy Gray Collaboration "Leave Me Lonely"

Ariana Grande has been teasing new music from her forthcoming album Grown Woman, including a new song with frequent collaborator Nicki Minaj.

Although that song has yet to be released, the two teamed up this week for a surprise as Nicki welcomed Grande on stage Thursday, April 7 at the Las Vegas’ opening of its newest venue, T-Mobile Arena.

The two performed their collaboration “Get on Your Knees” from Nicki’s album The Pinkprint, for the first time ever. Grande also debuted “Leave Me Lonely,” her new collaboration with Macy Gray off her upcoming album. Get into that below.