Justin Bieber and Selena Gomez performed “One Less Lonely Girl” on Dick Clark’s New Year’s Rockin’ Eve in Las Vegas Thursday evening.

The 15-year-old Bieber brought her “girl”-friend Selena on stage to serenade her. Selena sang along with Justin and even danced with the teen heartthrob on stage!

Watch the video of their performance below:

Video: Justin Bieber and Selena Gomez: One Less Lonely Girl

Selena & The Scene also performed “More.”

The two teen stars will host and perform at Pop-Con, an all-day festival which will take place in New York City on February 20.

[via JJ-Jr]