Ariana Grande has surprised fans with a performance at tomorrow's Amazon Music Unboxing Prime Day concert in New York. The 25-year-old's stage takeover will be streamed globally for fans to watch at home at beginning at 8 p.m. ET. The "Bang Bang" singer will be joining the previously announced acts Kelsea Ballerini, Alessia Cara and Julia Michaels and will play some of her most popular hits as well as songs from her upcoming album, Sweetener. 

If you happen to miss the live stream, her set will be available for replay after tomorrow, Variety reports. Amazon Prime Day beings on July 16th and offers Prime members with more than a million deals for 24 hours. 

In other Ariana news, her and Nicki Minaj seem to not just be good friends but also good collaborators and they've openly talked about a possible joint album. Nicki hit up Twitter and asked her fans to vote if they wanted to see a joint tape from her and Ariana. Needless to say, over 50% of voters were down, so we may get something from the duo in the far future considering they both have solo albums on the way as of now.