"Katy Perry goes all out as Jane Lane from Daria at the Hollywood Forever Cemetery Halloween Party on Wednesday (October 31) in Hollywood.
The 28-year-old singer was joined at the bash by Emma Roberts, Rose McGowan, Chris Evans, Aziz Ansari, and Adrian Grenier, among others.
Emma dressed as a cat, and posed for a picture next to someone in a Scream mask (Emma starred in Scream 4).Rose looked pretty as a Snow Queen.Chris rocked a Hawaiian shirt, whileAziz chose a Thomas the Tank Engine get up. Adrian looked tough as a ninja!"
(SOURCE: http://www.justjared.com/2012/11/01/katy-perry-emma-roberts-forever-cemetery-halloween-party/)