Ariana Grande Uses Justin Bieber, *NSYNC, & Rihanna In Her Lip Sync Conversation With Jimmy Fallon -- Watch!

Whenever Ariana Grande shows up on TV, we know we're in for a treat — which is why we are so happy she stopped by The Tonight Show Monday night! The 22-year-old stopped by to chat with Jimmy Fallon and to promote her upcoming album Dangerous Woman which is due out on May 20. However, Miz