When Kendall Jenner took the stage at this weekend's Billboard Music Awards, things seemed promising. The younger sister of the Kardashian siblings was tasked with introducing the band 5 Seconds of Summer (admittedly, kind of a hard name to say). While she was able to get a lot of facts down about the band (they are a band! they are on the Billboard charts!), she totally fell down on actually saying their name, which is kind of an essential part of introducing someone. Oops!