A source close to the situation explained:
Add Selena Gomez to the list!
Twerking is seriously a mad movement, and no one is safe from being sucked in!
Although you might think it's about time for it to die down, twerking is more alive than ever. And it tried damn hard to pop up at Selenita's concert in Vancouver last week as she did her best to compete with all the other twerking pros.
With Rihanna's Birthday Cake playing in the background, Selenita sort of twerked it out…although some might call it more of a hip shake!
But, please, judge for yourself! Ch-ch-check it out (above)!
[Video via Splash News.]