Happy Halloween! Is your musician costume ready? Do you need a last-minute idea? If you have a Cubs jersey you can be Sad Jack White. Or you can go as Sia and have your back to everyone all night. Um … Sexy Bon Iver? Zombie Lana Del Rey? You = Mark Kozelek, your friend = a hillbilly? This is hard. Please share a photo of your costume (or a costume idea) in the comments. Before we get into this week’s spookiest comments from our 1989/RTJ2 standoff, here are what some of your favorite artists and Justin Bieber look like in costume…

Future Islands

Happy Halloween!!!!!!

A photo posted by Future Islands (@future_islands) on Oct 10, 2014 at 11:23am PDT

Grimes

A photo posted by Grimezsz (@actuallygrimes) on Oct 10, 2014 at 6:54pm PDT

Mac DeMarco

#godblessusall #halloweenisuponus #halloweentinypenis #jimmyareyouthere? #jimihendrix #penissandwich #iloveny

A photo posted by @macdemarco on Oct 10, 2014 at 10:26am PDT

Taylor Swift

Cause, darling I'm a nightmare dressed like a PEGACORN. #HappyHalloween!

A photo posted by Taylor Swift (@taylorswift) on Oct 10, 2014 at 4:49am PDT

Chance The Rapper & Vic Mensa

bet naught f w muh gang

A photo posted by @vicmensa on Oct 10, 2014 at 5:21pm PDT

Jessie Ware (2013)

#FBF Halloween 2013 at The Fillmore Silver Spring with these guys

A photo posted by Jessie Ware (@jessieware) on Oct 10, 2014 at 11:05am PDT

“Marnie Stern”

Here's my first Halloween selfie since I have share such a strong resemblance to the girl from Frozen

A photo posted by Marnie Stern (@marniestern) on Oct 10, 2014 at 3:14pm PDT

Lily Allen

Lily Allen stands up for Kesha and dresses up as ''Doctor'' Luke: mocks him http://t.co/kn5Nivixug pic.twitter.com/llunlf9cIv

— Kesha | FOTP (@FOTPKesha) October 31, 2014

Sky Ferreira