But if fans are correct, one particular costume was served with a side of shade.
One of Kim Kardashian's many 2017 Halloween costumes included the late Latina musician, Selena Quintanilla-Pérez.
You've gotta admit, she NAILED the look.
But fans have detected a touch of shade in the reality star's caption.
"My fave Selena!!!!" She wrote... as in of all the famous Selena's, she's the fave... not Selena Gomez.
HOW DARE SHE!
Selena lovers and haters have taken to Twitter to comment on Kimmy K's shady move.
It makes sense that Kim isn't a fan of queen Sel as she is Taylor Swift's bestie (AKA Kim's arch nemesis) which makes them enemies by association.
But still, Selena did nothing to you Kim. The shade is V. unnecessary!