During "America´s Got Talent" in 2011, Justin Bieber's dobbelt-ganger sang "What The Hell". It's a copy of one of Justin's songs. Which one?

Explanation

Justin has a dobbelt-ganger named Dani Shay. She participated in "America´s Got Talent" in 2011, and made the viewers looks twice. She looks and sounds exactly like Justin, the only difference being that she is a girl.