Aussie singer and songwriter (full name Sia Furler) recently sat down with the New York Times to dish on working with some of the biggest pop stars in the world. Here are the juiciest revelations from Sia's epic profile. 1. Katy Perry Should Check Her Emails: Beyoncé's song "Pretty Hurts" was actually originally written by Sia for Katy Perry! According to the NYT, "Furler emailed the song to her friend Katy Perry, but Perry didn't see the email. So Furler passed the song along to Rihanna's manager, who held it for eight months, but ultimately did not pay the fee to secure the track." Sia adds, "'When Beyoncé heard it, she slid into home base and just closed the deal.'" Perry later heard the Bey track and texted Sia, "I'm pretty hurt you never sent me this song," to which Sia responded, "Check your email."