Ariana Grande performed.
Ariana Grande-Butera ( born June 26 , 1993 ) , known as Ariana Grande ( [ ˌɑriˈɑːnə_ˈɡrɑːndeɪ ] ) , is an American singer and actress . She began her career in the Broadway musical 13 , before landing the role of Cat Valentine in the Nickelodeon television series Victorious in 2009 .