Believe it or not, there are levels to this couples costume story. First, real human couple Phil Mok and Kelli Raisler came up with a pretty great dual costume idea. They went as Randy Marsh and Randy-Marsh-As-Lorde (if you watch South Park, they mocked the whole "how old is Lorde" thing by making her secretly a 40-something dude—specifically, Randy). 

The costumes that got @kalieda and I on Reddit. #lorde #randymarsh #southpark #feelinggoodonawednesday

A post shared by Phil Mok (@plmok61) on

At first, as you can see on their Instagram accounts, Phil was dressed as Lorde and Kelli was dressed as Randy. Then, halfway through the party, this happened:

Sources: Phil Mok