Well, it looks like Katy Perry missed out on a great song because she didn't check her email!! Sia had originally written the song "Pretty Hurts" - which is now a song on Beyonce's latest album - for Katy Perry, but she missed out on recording it because she never checked the email!!!
The song was then sent to Rihanna's team, who held it for 8 months, but ended up not paying to keep it on hold. After that, Beyonce heard the song, recorded it right away and got it on her new album!!
Katy apparently texted Sia saying she "pretty hurt" the song was never sent to her once she heard Bey's version, at which Sia said, "Check your email."