He also does a great velociraptor impression:

Ariana Grande showed off her singing and impression skills performing the songs of other popular singers in this sketch. She is also making headlines for uttering profanity during her monologue. 

This isn't the first time she's shown off her amazing skill for impersonation. She was also very convincing in an appearance on the Tonight Show:

There can be nothing but annoyance from a fire alarm impression that good.

His Rick impression is pretty good too.