Ke$ha's Wild Wango Tango Night

The 23-year-old treated the packed house a four-song set, which included her hits “Blah Blah Blah,” “Party at a Rich Dude’s House,” “Your Love is My Drug,” and “Tik Tok.”

This year's event, co-hosted by Britney Spears and Ryan Seacrest, also offered up musical spots from Jennifer Lopez, Pitbull and Selena Gomez.