Ariana Grande Performs Whitney Houston Medley on 'Greatest Hits' (Video)

Ariana Grande sings her heart out while performing a medley of Whitney Houston‘s hits for the live finale of ABC’s Greatest Hits on Thursday (August 4). The 23-year-old singer kicked off the night with her performances of “How Will I Know” and “Queen of the Night.” Watch the video below! “thank you so much @greatesthitsabc