The singer performed live during the annual Dick Clark's New Year's Rockin' Eve show in New York City.
After a performance which included her straddling a Santa Claus and smashing an Easter Bunny pinata, she shouted to the crowd: "Make 2011 our bitch!"
Later, minutes before midnight, host Ryan Seacrest asked the 23-year-old what her New Year's resolutions would be. She replied: "Not become a douchebag."
Seacrest responded: "You can do that" before moving on.