Monkey Business on the Red Carpet: 'Hangover''s Crystal Steals the Show

Crystal looks happy and comfy resting on Kristen Bell's head at the premiere of 'The Hangover Part II' at Grauman's Chinese Theatre in Hollywood. 

Crystal shows off her adorable personality while attending the premiere of 'The Hangover Part II' at Grauman's Chinese Theatre in Hollywood. 

Crystal and actor Ken Jeong both crack big smiles while attending the star-studded premiere of 'The Hangover Part II' at Grauman's Chinese Theatre in Hollywood. 

Crystal attends the premiere of 'The Hangover Part II' at Grauman's Chinese Theatre in Hollywood.

Crystal shows off her adorable personality while attending the premiere of 'The Hangover Part II' at Grauman's Chinese Theatre in Hollywood. 

Crystal shows off her adorable personality while attending the premiere of 'The Hangover Part II' at Grauman's Chinese Theatre in Hollywood.

Crystal waves to photographers and onlookers at the premiere of 'The Hangover Part II' at Grauman's Chinese Theatre in Hollywood. 

'The Hangover Part II''s newest cast member -- Crystal the monkey -- made a splash at the film's premiere last night by showing up in a pink gown and pearls and delighting the crowd with true star antics. Click through to see more of Crystal compete for the spotlight alongside the sequel's star-studded cast at Hollywood's famous Grauman's Chinese Theatre.