The “Die Young” singer and the 22-year-old British singer joined Sean Kingston, Conor Maynard, and Ne-Yo, who kicked off the show with his hit song “Let Me Love You (Until You Learn to Love Yourself)”.
Rita got the crowd pumping during “This Is How We Do (Party),” while Ke$ha closed the show with her new single “C’mon.”
On the same day, Ke$ha tweeted, “Happy NEW YEAR ANIMALS!! Let’s make 2013 the MOST MAGICAL YEAR EVER!!!!!!”
Ke$ha performing ‘C’Mon’
Rita Ora performing ‘This Is How We Do (Party)’