Celebrity Halloween parties call for flawless costumes

There’s only one day a year that your alter ego gets to thrive, and these celebrities are letting their evil twins go all out.

Rihanna on Halloween in 2013 (left) and 2014 (right).

Miley Cyrus on Halloween in 2013.

Paris Hilton on Halloween in 2013.

Beyonce, Jay-Z, and Blue Ivy on Halloween in 2014.

Iggy Azalea on Halloween in 2013 and in 2014.

A young Kendall Jenner on Halloween and Jenner with Khloe Kardashian in 2014.

Kim Kardashian on Halloween in 2014.