You/Chunji karaoke to Barbie Girl. (You should expect a small bundle of these since you ya know asked for them.)
"I'M A BARBIE GIRL IN A BARBIE WOOO~~ORLD, LIFE IS PLASTIC, IT'S FANTASTIC!" Katie is more than a little tipsy, but still functioning well enough to bounce around the room, singing Barbie World as loudly as possible and laughing hysterically when Chunji starts strutting around the room, petting his hair and pulling on his shirt.
"YOU CAN BRUSH MY HAIR, UNDRESS ME ANYWHE~~EEERE, IMAGINATION, LIFE IS YOUR CREATION~!"
(Bonus: "Wow, this song is terrible." "This song is also my childhood so you can SHUT UP, BARBIE, IT'S TIME TO PARTY, AH AH AH YEAHHH~!")